cas 2536-91-6, 2-Amino-6-methylbenzothiazole

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Condensation of 2-Amino-1,3-thiazole Salts and Benzo Analogs with Trifluoroacetylacetone
Abstract: The condensation of 2-amino-1,3-thiazolium perchlorates and their benzo analogs with trifluoro-acetyl-acetone in acetic acid afforded the corresponding [1,3]thiazolo[3,2-a]pyrimidinium, pyrimido[2,1-b][1,3]benzothiazolium, and naphtho[2′,1′:4,5][1,3]thiazolo[3,2-a]pyrimidinium salts as a single isomer in which the trifluoromethyl group is located in the γ-position with respect to the bridgehead nitrogen atom. The structure of the synthesized compounds was confirmed by 1H NMR spectra and elemental analyses.
Shulga,Simurova,Shulga
p. 364 - 368
(2021/04/13)

An efficient one-pot synthesis of 2-aminobenzothiazoles from substituted anilines using benzyltrimethylammonium dichloroiodate and ammonium thiocyanate in DMSO:H2O
Treatment of a variety of substituted anilines with benzyltrimethylammonium dichloroiodate (1.2 equiv) and ammonium thiocyanate (1.0 equiv) in DMSO:H2O (9:1) at 70 °C gave the corresponding 2-aminobenzothiazoles in excellent isolated yields (75–97%; ave. yield for all substrates = 90%). The reaction worked well for 2(4)-mono-, 2,4-di-, or 3,4,5-tri-substituted anilines, and a wide range of both electron donating groups (MeO, HO, CF3O, Me) and electron withdrawing groups (NO2, CN, CO2Et, CO2H, Cl, F) were well tolerated. This method provides a useful alternative to other methods that are either less efficient (requiring 3–7 fold equivalents of reagents) or utilize highly toxic and corrosive liquid Br2 as the oxidizing agent.
Dass, Reuben,Peterson, Matt A.
supporting information

(2021/10/04)

Tandem Copper-Catalyzed Regioselective N-Arylation-Aza-Michael Addition: Synthesis of Tetracyclic 5 H-Benzothiazolo[3,2- a]quinazoline Derivatives
A copper-catalyzed tandem process integrating regioselective N-arylation, followed by aza-Michael addition, is disclosed using 2-aminobenzothiazoles and ortho-halo cinnamic acid congeners. This process generated diverse tetracyclic 5H-benzothiazolo[3,2-a]quinazoline derivatives in moderate to good yields. The present tandem reaction appears to proceed through concomitant ring opening of 2-aminobenzothiazole and S-arylation to give the ortho-cyanamide-substituted diaryl thioether intermediate. The thus generated intermediate likely undergoes an unprecedented Truce-Smiles-type rearrangement involving S- to N-aryl migration, followed by reformation of the thiazole ring and intramolecular aza-Michael addition to furnish the title products.
Honnanayakanavar, Jyoti M.,Harish, Battu,Nanubolu, Jagadeesh Babu,Suresh, Surisetti
supporting information
p. 8780 - 8791
(2020/08/28)

Visible-light-initiated malic acid-promoted cascade coupling/cyclization of aromatic amines and KSCN to 2-aminobenzothiazoles without photocatalyst
By using ambient air as the oxidant and malic acid as the promoter, a practical method for the preparation of 2-aminobenzothiazoles through visible-light-initiated cascade reaction of aromatic amines and KSCN in eco-friendly bis(methoxypropy)ether under metal-, hazardous additive-, photocatalyst-free conditions was established.
He, Wei-Bao,Gao, Lan-Qing,Chen, Xin-Jie,Wu, Zhi-Lin,Huang, Ying,Cao, Zhong,Xu, Xin-Hua,He, Wei-Min
supporting information
p. 1895 - 1898
(2020/02/27)

A Novel Difluoroacetic Acid Derivatives Compound, and Composition Comprising the Same
The present invention relates to a novel difluoroacetic acid derivative compound and a composition for various uses containing the same, wherein the difluoroacetic acid derivative compound can not only act as an agonist activating one among PPARandalpha;, andbeta; or andgamma;, but also can exhibit double efficacy or triple efficacy. Therefore, the difluoroacetic acid derivative compound can more effectively prevent, alleviate or treat metabolic diseases in which PPARs involves, and further exhibits whitening and wrinkle alleviation activity, and anti-inflammatory and antioxidant effects, thereby being able to be usefully utilized as various compositions.COPYRIGHT KIPO 2020
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Paragraph 0086-0093

(2020/04/23)

Visible-light photoredox catalytic approach for the direct synthesis of 2-aminobenzothiazoles from anilines
A novel, highly efficient and convenient approach for the visible-light-promoted direct synthesis of 2-aminobenzothiazoles from anilines and ammonium thiocyanate is presented. The reaction involves addition/cyclization cascade of SCN radical and anilines under photoredox catalysis with Ru(bpy)3Cl2. The salient features of the protocol include the utilization of atmospheric oxygen and visible light as clean, inexpensive and sustainable resources at room temperature.
Dhar S. Yadav, Lal,Krishna Pal Singh, Rana,Singh, Manjula
(2020/02/13)

ARS-TiO2 photocatalyzed direct functionalization of sp2 C-H bonds toward thiocyanation and cyclization reactions under visible light
An ARS-TiO2 photocatalyst has been prepared, by a simple method through stirring a mixture of ARS and TiO2 at room temperature in the dark, to extend the photocatalytic response of titanium dioxide toward the visible light spectrum. The synergic effect of ARS and TiO2 in the photocatalyst system has catalyzed direct C-H functionalization of sp2 C-H bonds toward thiocyanation and cyclization reactions. Several aromatic and heteroaromatic scaffolds (2-phenylamino-thiazole, phenol, aniline, indole and pyrrole derivatives) were treated with the thiocyanate anion at room temperature. Herein, the first report on thiocyanation of phenol and synthesis of 2-aminobenzothiazole derivatives under visible light is presented.
Hosseini-Sarvari, Mona,Hosseinpour, Zeinab,Koohgard, Mehdi,Sarvestani, Abdollah Masoudi
p. 1401 - 1407
(2020/03/26)

Synthesis, Type II diabetes inhibitory activity, antimicrobial evaluation and docking studies of indeno[1,2-c]pyrazol-4(1H)-ones
We report a convenient and efficient synthesis of indeno[1,2-c]pyrazol-4(1H)-ones (4a?o) by the reaction of a variety of 2-acyl-(1H)-indene-1,3(2H)-diones (1) and 2-hydrazinylbenzo[d]thiazole/2-hydrazinyl-6-substitutedbenzo[d]thiazoles (2) in the presence of glacial acetic acid in good yields. The structure of the compounds thus prepared were confirmed by analytical and spectral (FT-IR, 1H NMR, 13C NMR, and HRMS) techniques. All the synthesized indeno[1,2-c]pyrazol-4(1H)-ones (4a?o) were assayed for their in vitro Type II diabetes inhibitory activity by using Acarbose as standard drug and in vitro antimicrobial activity utilizing Streptomycin and Fluconazole as reference drugs. Among the synthesized derivatives, 4e (IC50 = 6.71 μg/mL) was found to be more potent against α-glucosidase enzyme as compared with the standard Acarbose (IC50 = 9.35 μg/mL) and 4i (IC50 = 11.90 μg/mL) exhibited good inhibitory activity against α-amylase enzyme as compared with the standard Acarbose (IC50 = 22.87 μg/mL). Also, all the titled compounds showed good antimicrobial activity. In addition, in vitro α-glucosidase and α-amylase inhibition were supported by docking studies performed on the derivatives 4e and 4o, respectively. [Figure not available: see fulltext.].
Mor, Satbir,Sindhu, Suchita
p. 46 - 62
(2019/11/13)

Discovery of novel pyrimidine-based benzothiazole derivatives as potent cyclin-dependent kinase 2 inhibitors with anticancer activity
To develop novel CDK2 inhibitors as anticancer agents, a series of novel pyrimidine-based benzothiazole derivatives were designed and synthesized. Initial biological evaluation demonstrated some of target compounds displayed potent antitumor activity in vitro against five cancer cell lines. Especially, the analogue 10s exhibited approximately potency with AZD5438 toward four cells including HeLa, HCT116, PC-3, and MDA-MB-231 with IC50 values of 0.45, 0.70, 0.92, 1.80 μM, respectively. More interestingly, the most highly active compound 10s in this study also possessed promising CDK2/cyclin A2 inhibitory activities with IC50 values of 15.4 nM, which was almost 3-fold potent than positive control AZD5438, and molecular docking studies revealed that the analogue bound efficiently with the CDK2 binding site. Further studies indicated that compound 10s could induce cell cycle arrest and apoptosis in a concentration-dependent manner. These observations suggest that pyrimidine-benzothiazole hybrids represent a new class of CDK2 inhibitors and well worth further investigation aiming to generate potential anticancer agents.
Diao, Peng-Cheng,Lin, Wei-Yuan,Jian, Xie-Er,Li, Yan-Hong,You, Wen-Wei,Zhao, Pei-Liang
p. 196 - 207
(2019/07/02)

Novel Triapine Derivative Induces Copper-Dependent Cell Death in Hematopoietic Cancers
Triapine, an iron chelator that inhibits ribonucleotide reductase, has been evaluated in clinical trials for cancer treatment. Triapine in combination with other chemotherapeutic agents shows promising efficacy in certain hematologic malignancies; however, it is less effective against many advanced solid tumors, probably due to the unsatisfactory potency and pharmacokinetic properties. In this report, we developed a triapine derivative IC25 (10) with potent antitumor activity. 10 Preferentially inhibited the proliferation of hematopoietic cancers by inducing mitochondria reactive oxygen species production and mitochondrial dysfunction. Unlike triapine, 10 executed cytotoxic action in a copper-dependent manner. 10-Induced up-expression of thioredoxin-interacting protein resulted in decreased thioredoxin activity to permit c-Jun N-terminal kinase and p38 activation and ultimately led to the execution of the cell death program. Remarkedly, 10 showed good bioavailability and inhibited tumor growth in mouse xenograft models. Taken together, our study identifies compound 10 as a copper-dependent antitumor agent, which may be applied to the treatment of hematopoietic cancers.
Chen, Ge,Niu, Chunyi,Yi, Jianhua,Sun, Lin,Cao, Hengyi,Fang, Yanjia,Jin, Taijie,Li, Ying,Lou, Chunli,Kang, Jingwu,Wei, Wanguo,Zhu, Jidong
(2019/04/01)

Novel Triapine Derivative Induces Copper-Dependent Cell Death in Hematopoietic Cancers
Triapine, an iron chelator that inhibits ribonucleotide reductase, has been evaluated in clinical trials for cancer treatment. Triapine in combination with other chemotherapeutic agents shows promising efficacy in certain hematologic malignancies; however, it is less effective against many advanced solid tumors, probably due to the unsatisfactory potency and pharmacokinetic properties. In this report, we developed a triapine derivative IC25 (10) with potent antitumor activity. 10 Preferentially inhibited the proliferation of hematopoietic cancers by inducing mitochondria reactive oxygen species production and mitochondrial dysfunction. Unlike triapine, 10 executed cytotoxic action in a copper-dependent manner. 10-Induced up-expression of thioredoxin-interacting protein resulted in decreased thioredoxin activity to permit c-Jun N-terminal kinase and p38 activation and ultimately led to the execution of the cell death program. Remarkedly, 10 showed good bioavailability and inhibited tumor growth in mouse xenograft models. Taken together, our study identifies compound 10 as a copper-dependent antitumor agent, which may be applied to the treatment of hematopoietic cancers.
Chen, Ge,Niu, Chunyi,Yi, Jianhua,Sun, Lin,Cao, Hengyi,Fang, Yanjia,Jin, Taijie,Li, Ying,Lou, Chunli,Kang, Jingwu,Wei, Wanguo,Zhu, Jidong
p. 3107 - 3121
(2019/04/01)

Convenient and efficient synthesis of novel 11: H -benzo[5,6][1,4]thiazino[3,4- a] isoindol-11-ones derived from 2-bromo-(2/3-substitutedphenyl)-1 H -indene-1,3(2 H)-diones
An unprecedented formation of 11H-benzo[5,6][1,4]thiazino[3,4-a]isoindol-11-ones through a one-step reaction of differently substituted 2-aminobenzenethiols and 2-bromo-(2/3-substitutedphenyl)-1H-indene-1,3(2H)-diones in freshly dried ethanol under reflux conditions has been investigated. This unique transformation probably occurs through an initial nucleophilic substitution followed by ring opening and subsequent intramolecular cyclization. The structures of all the synthesized benzo[1,4]thiazino isoindolinones were established by FTIR, 1H NMR, 13C NMR, HRMS, and X-ray crystallographic analysis. This approach was found to be simple and convenient and provides several advantages such as substantial atom economy, short reaction time and operational simplicity.
Mor, Satbir,Sindhu, Suchita
p. 12784 - 12792
(2019/05/10)

Phthaloyl Dichloride–DMF Mediated Synthesis of Benzothiazole-based 4-Formylpyrazole Derivatives: Studies on Their Antimicrobial and Antioxidant Activities
Benzothiazole-based pyrazole derivatives prepared by a molecular hybridization approach with an aim to influence the biological activity significantly. Efficient conversion of hydrazones 3a–k derived from their corresponding methyl ketones to 4-formylpyrazoles 4a–k was carried out at 60°C in dioxane, using the Vilsmeier–Haack reagent isolated from phthaloyl dichloride and N,N-dimethylformamide. The newly synthesized compounds 4a–k and hydrazones 3a–k were screened in vitro for their antimicrobial activities using the broth macrodilution method. The compounds 4a–k were also screened for their antioxidant activities using the DPPH radical scavenging assay. Some of the synthesized compounds showed significant antibacterial and antifungal activities as evident from their minimum inhibitory concentrations. Compound 4d showed remarkable antioxidant activity.
Bala, Renu,Kumari, Poonam,Sood, Sumit,Kumar, Vinod,Singh, Nasib,Singh, Karan
p. 2507 - 2515
(2018/09/25)

Discovery of 18β-glycyrrhetinic acid conjugated aminobenzothiazole derivatives as Hsp90-Cdc37 interaction disruptors that inhibit cell migration and reverse drug resistance
A series of 18β-glycyrrhetinic acid (GA) conjugated aminobenzothiazole derivatives were designed, synthesized and evaluated for disruption activity of Hsp90-Cdc37 as well as the effects of in vitro cell migration. These compounds exhibited relatively good disruption activity against Hsp90-Cdc37 with IC50 values in low micromolar range. A docking study of the most active compound 11g revealed key interactions between 11g and Hsp90-Cdc37 complex in which the benzothiazole moiety and the amine chain group were important for improving activity. It is noteworthy that further antitumor activity screening revealed that some compounds exhibited better inhibitory activity than the commercial anticancer drug 5-FU and showed potent suppression activity against drug-resistant cancer cells. In particular, compound 11 g appeared to be the most potent compound against the A549 cell line, at least partly, by inhibition of the activity of Hsp90 and apoptosis induction. The treatment of A549 cells with compound 11g resulted in inhibition of in vitro cell migration through wound healing assay and S phase of cell cycle arrested. In addition, 11g-induced apoptosis was significantly facilitated in A549 cells. Thus, we conclude that GA aminobenzothiazole derivatives may be the potential Hsp90-Cdc37 disruptors with the ability to suppress cells migration and reversed drug-resistant.
Jin, Le,Huang, Rizhen,Huang, Xiaochao,Zhang, Bin,Ji, Min,Wang, Hengshan
p. 1759 - 1775
(2018/03/01)

Novel SIRT 1 activator and medical use thereof
The present invention relates to a SIRT 1 activator and medical uses thereof. In the present invention, a novel SIRT 1 activator compound based on a benzo[d]thiazole skeleton, a crystalline form thereof, a hydrate thereof or a salt thereof is prepared, and effect on alleviating obesity, insulin resistance and dyslipidemia, alleviating fatty liver, preventing cell aging, preventing oxidative stress and extending of life of yeast. Therefore, the novel SIRT 1 activator compound having the above effects can be used for a pharmaceutical composition for therapeutic use for preventing or treating metabolic diseases including obesity, diabetes mellitus, dyslipidemia and the like and liver diseases including alcoholic or non-alcoholic fatty liver, fatty liver diseases and the like, and a health food composition for alleviating cell aging or prolonging the life span, and the like.COPYRIGHT KIPO 2018
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Paragraph 0151; 0195; 0198; 0200; 0201

(2018/11/27)

Design, synthesis, and molecular docking study of benzothiazolotriazine derivatives for anticonvulsant potential
A series of newer benzothiazolotriazine derivatives (4a–k) was designed, synthesized, and characterized as anticonvulsant agents against the two classically used MES and scPTZ animal models. The synthesized derivatives were tested in vivo in both the animal models, followed by a neurotoxicity study by the rotarod method. Compound 4e, 8-chloro-4-(2-chlorocyclohexa-1,5-dien-1-yl)-2-((4-methoxybenzyl)thio)-10aH-benzo[4,5]thiazolo[3,2a][1,3,5]triazine was found most promising among the series in both the animal models, with no neurotoxicity. From this it may be confirmed that the presence of a methoxy (OCH3) group at the lipophilic aryl ring was showing high anticonvulsant potency. In the molecular modeling study, compound 4e (docking score = ?8.70) showed important hydrogen bond interaction with the amino acids LYS 329, SER 137, GLY 136 and π–π interactions with PHE 189 at the active site of GABA-AT. These derivatives can be further explored for the development of newer/novel anticonvulsant agents.
Firdaus, Jannat Ul,Habib, Anwar,Siddiqui, Nadeem,Alam, Ozair,Naim, Mohd. Javed,Partap, Sangh,Sahu, Meeta
(2018/12/04)

Design, synthesis, docking studies and biological evaluation of 2-phenyl-3-(Substituted benzo[d] thiazol-2-ylamino)-quinazoline-4(3H)-one derivatives as antimicrobial agents
Objective: A new series 2-phenyl-3-(substituted benzo[d] thiazol-2-ylamino)-quinazoline-4(3H)-one was prepared by the fusion method by reacting 2-phenyl benzoxazine with 2-hydrazino benzothiazole and it was evaluated for their antimicrobial activity against gram positive, gram negative bacteria and fungi. Methods: Titled compounds were synthesized by fusion reactions. These compounds were evaluated by in vitro antibacterial and antifungal activity using the minimum inhibitory concentration and zone of inhibition methods. The synthesized compounds were characterized with the help of infrared, NMR and mass spectral studies. The benzothiazole moiety and the quinazoline ring have previously shown DNA gyrase inhibition and target related antibacterial activity. Thus, molecular docking studies of synthesized compounds were carried out (PDB: 3G75) to study the possible interaction of compounds with the target. The batch grid docking was performed to determine the probable. Results: These compounds showed significant activity against gram positive and gram negative bacteria as well against the fungi. The compound A5 was found to be active against B. subtilis, P aeruginosa and C. albican at 12.5 μg/ml MIC. The compound A3 was found to be active against all microbial strains selected at 25 and 12.5 μg/ml MIC. Conclusion: Though the relationship between the activities shown by these compounds in, the antimicrobial study is still to be established, the docking studies conducted found to be consistent with antimicrobial results. Thus the results indicate that the designed structure can be a potential lead as an antimicrobial agent.
Pisal, Pooja,Deodhar, Meenakshi,Kale, Amol,Nigade, Ganesh,Pawar, Smita
p. 57 - 61
(2018/10/31)

Rapid and efficient thiocyanation of phenols, indoles, and anilines in 1,1,1,3,3,3-hexafluoro-2-propanol under ultrasound irradiation
An efficient ultrasound-promoted thiocyanation of phenols, indoles, and anilines in the presence of N-chlorosuccinimide and NH4SCN using 1,1,1,3,3,3-hexafluoro-2-propanol as the solvent has been developed. The major features of the present protocol include the mild reaction conditions, short reaction times, good to excellent yields, and broad substrate scope. Moreover, scale-up synthesis can be achieved and the solvent can be easily recovered and reused.
Wang, Zhonghao,Wang, Liang,Chen, Qun,He, Ming-yang
supporting information
p. 76 - 84
(2017/12/28)

Transition-metal-free regioselective thiocyanation of phenols, anilines and heterocycles
An expedient direct and regioselective thiocyanation of phenols, anilines and heterocycles is described. Transformation is realized via the direct C[sbnd]H functionalization under transition metal free conditions at ambient temperature in excellent yields. Method proved to be monoselective and variety of functional groups tolerated the reaction conditions. The practicality of the protocol is demonstrated in gram scale synthesis of a precursor of PPAR δ agonist in excellent yield.
Mete, Trimbak B.,Khopade, Tushar M.,Bhat, Ramakrishna G.
supporting information
p. 415 - 418
(2017/01/10)

Copper-Catalyzed Aerobic Oxidative Regioselective Thiocyanation of Aromatics and Heteroaromatics
A copper-catalyzed aerobic oxidative reaction between aromatics or heteroaromatics with KSCN is developed by using O2 as the oxidant. The combination of Cu(OTf)2, N,N,N′,N′-tetramethylethylenediamine (TMEDA) and BF3·Et2O provides an efficient catalytic system, affording substituted thiocyanation products and 2-aminobenzothiazoles in excellent yields. The reaction also possesses a good functional group tolerance for both strong electron-withdrawing and electron-donating groups.
Jiang, Huanfeng,Yu, Wentao,Tang, Xiaodong,Li, Jianxiao,Wu, Wanqing
p. 9312 - 9320
(2017/09/22)

Regioselective Synthesis, Antimicrobial Evaluation and QSAR Studies of Some 3-Aryl-1-heteroarylindeno[1,2-c]pyrazol-4(1H)-ones
A series of seventeen 3-aryl-1-heteroarylindeno[1,2-c]pyrazol-4(1H)-ones (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, 4k, 4l, 4m, 4n, 4o, 4p, 4q) has been synthesized and characterized by spectral (IR, 1H NMR, and mass), X-ray crystallography and analytical results. All the indenopyrazoles (4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4j, 4k, 4l, 4m, 4n, 4o, 4p, 4q) were tested for their in vitro antimicrobial activity against two Gram-positive bacteria viz. Bacillus subtilis (MTCC 441) and Staphylococcus aureus (MTCC 7443), two Gram-negative bacteria, viz. Escherichia coli (MTCC 42) and Pseudomonas aeruginosa (MTCC 741) and two fungi, viz. Candida albicans (MTCC 183) and Aspergillus niger (MTCC 282) using ceftriaxone and fluconazole as standard references against bacterial and fungal strains, respectively. Among the synthesized derivatives, 4f against B. subtilis and S. aureus, 4e against E. coli, 4g and 4j against P. aeruginosa, 4k and 4l against C. albicans, and 4k against A. niger were found to exhibit appreciable antimicrobial activities. However, 4g (minimum inhibitory concentration, 0.0036 μmol/mL) was found to be more potent than the reference, that is, fluconazole (minimum inhibitory concentration, 0.0050 μmol/mL) against A. niger. Moreover, both antibacterial and antifungal activities were found to be prolific. The radial distribution function parameters were found to be important for description of activities against the modeled strains in quantitative structure–activity relationship studies.
Mor, Satbir,Mohil, Rajni,Nagoria, Savita,Kumar, Ashwani,Lal, Kashmiri,Kumar, Devinder,Singh, Virender
p. 1327 - 1341
(2017/03/27)

Synthesis of Indane-Based 1,5-Benzothiazepines Derived from 3-Phenyl-2,3-dihydro-1H-inden-1-one and Antimicrobial Studies Thereof
In the present study, a series of 20 indane-based 1,5-benzothiazepines (5a–t) has been prepared derived from 3-phenyl-2,3-dihydro-1H-inden-1-one (1). All the synthesized 1,5-benzothiazepines (5a–t) were screened for their in vitro antimicrobial activities against four bacteria [Bacillus subtilis (MTCC 441), Staphylococcus epidermidis (MTCC 6880), Escherichia coli (MTCC 1652), and Pseudomonas aeruginosa (MTCC 424)] and two fungi [Candida albicans (MTCC 227) and Aspergillus niger (MTCC 8189)]. Among all the tested derivatives, 5n and 5o against E.?coli displayed more inhibitory activity than that of the reference drug, ciprofloxacin, while the derivatives 5c, 5m–o, 5s, and 5t against C.?albicans, and 5d, 5e, 5n, 5o, 5s, and 5t against A.?niger were found to be more potent than the standard drug, that is, fluconazole.
Mor, Satbir,Nagoria, Savita,Sindhu, Suchita,Khatri, Mohini,Sidhu, Gurdeep,Singh, Virender
p. 3282 - 3293
(2017/10/06)

Probing the ATP-Binding Pocket of Protein Kinase DYRK1A with Benzothiazole Fragment Molecules
DYRK1A has emerged as a potential target for therapies of Alzheimer's disease using small molecules. On the basis of the observation of selective DYRK1A inhibition by firefly d-luciferin, we have explored static and dynamic structural properties of fragment sized variants of the benzothiazole scaffold with respect to DYRK1A using X-ray crystallography and NMR techniques. The compounds have excellent ligand efficiencies and show a remarkable diversity of binding modes in dynamic equilibrium. Binding geometries are determined in part by interactions often considered "weak", including "orthogonal multipolar" types represented by, for example, F-CO, sulfur-aromatic, and halogen-aromatic interactions, together with hydrogen bonds that are modulated by variation of electron withdrawing groups. These studies show how the benzothiazole scaffold is highly promising for the development of therapeutic DYRK1A inhibitors. In addition, the subtleties of the binding interactions, including dynamics, show how full structural studies are required to fully interpret the essential physical determinants of binding.
Rothweiler, Ulli,Stensen, Wenche,Brandsdal, Bj?rn Olav,Isaksson, Johan,Leeson, Frederick Alan,Engh, Richard Alan,Svendsen, John S. Mj?en
p. 9814 - 9824
(2016/11/19)

GK and PPAR dual agonist activity containing dimethyl aryl urea derivatives
The invention discloses a novel arylurea derivative, its preparation method, a pharmaceutical composition and an application thereof. Specifically, the invention relates to an arylurea derivative as shown in the general formula I, its medicinal salt, a preparation method thereof, a composition containing one or more of the compounds, and an application of the compounds in treatment of glucokinase and peroxisome proliferator-activated receptor related diseases such as diabetes, obesity and the like.
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Paragraph 0154; 0156-0157

(2016/10/20)

Efficient and facile protocol for one-pot synthesis of 2-amino-substituted benzothiazoles catalyzed by nano-BF3/SiO2 under mild conditions
Abstract: A highly efficient and simple protocol for the preparation of 2-aminobenzothiazoles through the reaction of potassium thiocyanate and substituted anilines in the presence of nano-BF3/SiO2 as a reusable heterogeneous catalyst is described. In this method, all of the 2-amino-substituted benzothiazoles were obtained in high to excellent yields and short reaction times under mild conditions. The structures of the resulting products were characterized and confirmed by melting point, FT-IR, 1H NMR and 13C NMR techniques. Graphical Abstract: A highly efficient and simple protocol for the preparation of 2-aminobenzothiazoles by reaction of potassium thiocyanate and substituted anilines in the presence of nano-BF3/SiO2 as a reusable heterogeneous catalyst is described.[Figure not available: see fulltext.]
Naeimi, Hossein,Heidarnezhad, Arash
p. 7855 - 7868
(2016/11/25)

Efficient and convenient synthesis, characterization, and antimicrobial evaluation of some new tetracyclic 1,4-benzothiazines
In the present study, 20 new tetracyclic 1,4-benzothiazines (4a-4 t) were conveniently synthesized in good yields and characterized by different spectral and physical techniques. The in vitro antimicrobial evaluation of the synthesized benzothiazine derivatives was performed by serial dilution against two Gram-positive bacteria [Bacillus subtilis (MTCC 441) and Staphylococcus epidermidis (MTCC 6880)], two Gram-negative bacteria [Escherichia coli (MTCC 1652) and Pseudomonas aeruginosa (MTCC 424)], and two fungal strains [Candida albicans (MTCC 227) and Aspergillus Niger (MTCC 8189)]. The derivatives 4 l and 4 t were found to be more potent than standard drug, i.e., fluconazole, against A. Niger and C. albicans, respectively.
Mor, Satbir,Nagoria, Savita
supporting information
p. 169 - 178
(2016/02/23)

Colourless p-phenylene-spaced bis-azoles for luminescent concentrators
We report on the synthesis of new push-pull imidazole-benzothiazole and thiazole-benzothiazole fluorophores obtained in good yields by using direct C-H arylation synthetic strategies. Spectroscopic investigations in CHCl3 solution evidenced that the 1,4-phenylene-spaced imidazole-benzothiazole bearing an electron-donating dimethylamino group achieved a trade-off between fluorescence maximum (516 nm), Stokes shift (165 nm) and a quantum yield higher than 0.4. Dispersions of the selected fluorophore in poly (methyl methacrylate) (PMMA) thin films mostly maintained the optical features in solution with significant light transmittance in the visible region (90% at 440 nm), and a brilliant green emission at 500 nm. Photocurrent experiments performed on PMMA thin films coated over high purity transparent glasses promoted their use in the development of colourless luminescent solar concentrators with optical efficiencies close to 6%.
Bellina, Fabio,Manzini, Chiara,Marianetti, Giulia,Pezzetta, Cristofer,Fanizza, Elisabetta,Lessi, Marco,Minei, Pierpaolo,Barone, Vincenzo,Pucci, Andrea
p. 118 - 128
(2016/07/19)

PHARMACEUTICAL COMPOSITION FOR TREATING OR PREVENTING FOOT-AND-MOUTH DISEASE
The present invention refers to benzothiazole derivatives and its pharmaceutically acceptable salt as active ingredients opening including inverse number relates to a pharmaceutical composition for treating or preventing is. In addition, opening the present invention refers to treatment or prevention of inverse number relates to method. (by machine translation)
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Paragraph 0243-0246

(2017/01/02)

Synthesis, characterization and biological evaluation of benzothiazoles and tetrahydrobenzothiazoles bearing urea or thiourea moieties as vasorelaxants and inhibitors of the insulin releasing process
A series of 1,3-benzothiazoles (series I) and 4,5,6,7-tetrahydro-1,3-benzothiazoles (series II) bearing an urea or a thiourea moiety at the 2-position were synthesized and tested as myorelaxants and inhibitors of insulin secretion. Several compounds (i.e. 13u and 13v) from series I showed a marked myorelaxant activity. Benzothiazoles bearing a strong electron withdrawing group (NO2, CN) at the 6-position and an alkyl group linked to the urea or the thiourea function at the 2-position were found to be the most potent compounds. The weak vasorelaxant activity of series II compounds evidenced the necessity of the presence of a complete aromatic heterocyclic system. The myorelaxant activity of some active compounds was reduced when measured on aorta rings precontracted by 80 mM KCl or by 30 mM KCl in the presence of 10 μM glibenclamide, suggesting the involvement of KATP channels in the vasorelaxant effect. Some compounds of series I tested on rat pancreatic islets provoked a marked inhibition of insulin secretion, among which 13a exhibited a clear tissue selectivity for pancreatic β-cells.
Harrouche, Kamel,Renard, Jean-Francois,Bouider, Nafila,De Tullio, Pascal,Goffin, Eric,Lebrun, Philippe,Faury, Gilles,Pirotte, Bernard,Khelili, Smail
p. 352 - 360
(2016/04/06)

Catalytic Thiourea Promoted Electrophilic Thiocyanation of Indoles and Aromatic Amines with NCS/NH4SCN
A simple and efficient protocol for the electrophilic thiocyanation of indoles and aromatic amines with thiourea/NCS/NH4SCN system has been developed. The major features of the present procedure are the mild conditions, good yields, short reaction times, and the use of inexpensive and readily available organocatalyst. Moreover, N-chlorosuccinimide (NCS) was found to be indispensable, and thiourea could greatly promote the reaction.
Wang, Cancan,Wang, Zhonghao,Wang, Liang,Chen, Qun,He, Mingyang
supporting information
p. 1081 - 1085
(2016/11/25)

Synthesis of bioactive substituted pyrazolylbenzothiazinones
Abstract Pyrazolylbenzothiazinones have been synthesized in good yields by the reaction of 2-hydrazinocarbonymethyl-3,4-dihydro-2H-1,4-benzothiazin-3-ones with β-diketone in the presence of ethanol. The structures of synthesized pyrazolylbenzothiazinones were confirmed on the basis of their analytical and spectral data. The antimicrobial activities of the synthesized compounds have also been included.
Sharma, Praveen Kumar,Kumar
p. 6141 - 6148
(2015/08/18)

Synthesis, crystal structure, and antioxidant property of a new Co(III) coordination polymer based on ligand (E)-2-{2-[1-(1-methyl-1H-benzo[d]imidazol-2-yl)ethylidene]hydrazinyl}benzo[d]thiazole
A new Co(III) complex, [CoL2](ClO4)(CH3CN) (1) (HL = (E)-2-{2-[1-(1-methyl-1H-benzo[d]imidazol-2-yl)ethylidene]hydrazinyl}benzo[d]thizole), has been prepared by solvent evaporation method, and characterized by single-crystal X-ray diffraction, bond valence sum, and elemental analysis. The result of single-crystal X-ray diffraction analysis indicates that each Co(III) ion is six-coordinated by six nitrogen atoms from two L- to form distorted octahedral geometry. The hydrogen bonds and π.π stacking interactions ensure the cohesion of crystal lattice in a 3D supramolecular framework in the solid state. The antioxidant activities of HL and 1 were also studied.
Deng, Wen-Ting,Liu, Jia-Cheng,Cao, Ping,Xu, Ya-Qin
p. 667 - 672
(2015/04/16)

New Benzo[d]thiazol-2-yl-aminoacetamides as Potential Anticonvulsants: Synthesis, Activity and Prediction of Molecular Properties
A series of N-(substituted-2-oxo-4-phenylazetidin-1-yl)-2-((6-substitutedbenzo[d]thiazol-2-yl)amino)-acetamide derivatives were synthesized using pharmacophoric features with aromatic hydrophobic aryl ring (A), NH-C=O as hydrogen bonding domain, the nitrogen atom as electron donor (D), and phenyl as distal aryl ring (C). The synthesized molecules were initially screened for anticonvulsant activity using the maximal electroshock seizure (MES) test and the subcutaneous pentylenetetrazole test in albino mice. An acute neurotoxicity study on the synthesized molecules was also carried out using the rotarod test. The results of these tests revealed that two compounds, 5b and 5q, showed promising activity with ED50 values of 15.4 and 18.6 mg/kg and protective indices of 20.7 and 34.9 in the MES test, respectively, which are found to be approximately fourfold higher than those of the standard drugs phenytoin (6.9) and carbamazepine (8.1). These molecules may act as lead of the designed scheme. The pharmacokinetic profiles of all the synthesized compounds were estimated using Molinspiration software. None of the compounds violated Lipinski's "rule of five". The possible structure-activity relationship was discussed. In conclusion, this manuscript shows that the developed model has a highly prognostic power for the further investigation of better benzothiazole derivatives for future discovery and development.
Ali, Ruhi,Siddiqui, Nadeem
p. 254 - 265
(2015/04/14)

Catalytic N-formylation for synthesis of 6-substituted-2-benzothiazolylimino-5-piperazinyl-4-thiazolidinone antimicrobial agents
A new class of piperazine-based 2-benzothiazolylimino-4-thiazolidinones has been efficiently prepared via highly accelerated N-formylation of N-isopropylpiperazine by the use of a mild heterogeneous catalyst, sulfated tungstate. Heterocyclization of N-(benzo[d]thiazol-2-yl)-2-chloroacetamides (3a-j) by use of NH4SCN in ethanol under reflux efficiently furnished the intermediates 2-benzothiazolyliminothiazolidin-4-ones (4a-j). These were treated with 4-isopropylpiperazine-1-carbaldehyde (2) to prepare the final products 5a-j. The structures of the new derivatives were confirmed by elemental analysis and use of spectroscopic data (FTIR and 1H NMR). Their pharmacological potential as promising antimicrobial agents was determined in vitro against bacteria and a fungus; the lowest minimum inhibitory concentrations (MIC) observed were in the range 4-8 μg/mL.
Patel, Rahul V.,Park, Se Won
p. 5599 - 5609
(2015/07/08)

Chrysin-benzothiazole conjugates as antioxidant and anticancer agents
7-(4-Bromobutoxy)-5-hydroxy-2-phenyl-4H-chromen-4-one, obtained from chrysin with 1,4-dibromobutane, was combined with a wide range of 6-substituted 2-aminobenzthiazoles, which had been prepared from the corresponding anilines with potassium thiocyanate. Free radical scavenging efficacies of newer analogues were measured using DPPH and ABTS assays, in addition to the assessment of their anticancer activity against cervical cancer cell lines (HeLa and CaSki) and ovarian cancer cell line (SK-OV-3) implementing the SRB assay. Cytotoxicity of titled compounds was checked using Madin-Darby canine kidney (MDCK) non-cancer cell line. Overall, 6a-r indicated remarkable antioxidant power as DPPH and ABTS+ scavengers; particularly the presence of halogen(s) (6g, 6h, 6j-6l) was favourable with IC50 values comparable to the control ascorbic acid. Unsubstituted benzothiazole ring favored the activity of resultant compounds (6a and 6r) against HeLa cell line, whereas presence of chlorine (6g) or a di-fluoro group (6k) was a key to exert strong action against CaSki. Moreover, a mono-fluoro (6j) and a ketonic functionality (6o) were beneficial to display anticipated anticancer effects against ovarian cancer cell line SK-OV-3. The structural assignments of the new products were done on the basis of IR, 1H NMR, 13C NMR spectroscopy and elemental analysis.
Mistry, Bhupendra M.,Patel, Rahul V.,Keum, Young-Soo,Kim, Doo Hwan
supporting information
p. 5561 - 5565
(2015/11/17)

Polymethylhydrosiloxane derived palladium nanoparticles for chemo- and regioselective hydrogenation of aliphatic and aromatic nitro compounds in water
Chemo- and regioselective hydrogenation of a wide range of aliphatic, unsaturated, aromatic and heteroaromatic nitro compounds into their corresponding amines has been achieved with highly efficient polysiloxane-stabilised "Pd" nanoparticles on NAP-magnesium oxide supports using an environmentally friendly hydrogenating agent, polymethylhydrosiloxane [PMHS] in water. Highly stable and active Pd nanoparticles were prepared by the reduction of NAP-Mg-PdCl4 with PMHS, which serves as a reducing agent as well as a capping agent. The well-dispersed palladium nanoparticles on NAP-MgO catalysts also exhibit excellent regioselectivity in the hydrogenation of dinitrobenzenes to the corresponding nitroanilines. The catalyst has high durability against sintering during the hydrogenation reaction and can be reused with no loss in its activity. This journal is the Partner Organisations 2014.
Damodara, Dandu,Arundhathi, Racha,Ramesh Babu, T. Venkata,Legan, Margaret K.,Kumpaty, Hephzibah J.,Likhar, Pravin R.
p. 22567 - 22574
(2014/06/23)

In vitro biological investigations of novel piperazine based heterocycles
Eleven N.phenyl- and 11 N.benzothiazolyl-2-(4-(2,3,4-trimethoxybenzyl)piperazin-1-yl)acetamides have been synthesised by a simple and efficient method. The 22 novel compounds were tested for their in vitro biological efficacy against two Grampositive bacteria, three Gram-negative bacteria, two fungi and Mycobacterium tuberculosis H37Rv. The bioassay results revealed that the majority of the N.benzothiazole-substituted piperazine derivatives exhibited moderate to good bioefficacies with encouraging MICs. The influence of the presence or absence of various electron-withdrawing or -donating functional groups on the aryl acetamide moiety on the different bioassay results is discussed.
Chhatriwala, Nirmal M.,Patel, Amit B.,Patel, Rahul V.,Kumari, Premlata
p. 611 - 616
(2015/02/02)

Access to a new class of biologically active quinoline based 1,2,4-triazoles
As an aspect of our ongoing research in search of new antimicrobial armamentarium, a series of 1,2,4-triazol-3-ylthio-acetamides was constructed and in vitro analyzed for their antimicrobial activity against several bacteria and fungi. Aiming to establish an increased potency, the bioassay results were matched to those of 1,3,4-oxadiazoles, utilized previously. Remarkably, 1,2,4-triazoles were found to possess a good spectrum of antifungal potency, which eventually suggested the azole template as an essential pharmacophore to diversify the biological occupations of the attendant molecules. However, it was noticed that the potency of final analogs against each strain placed reliance on the type of substituent present on benzothiazole ring. The structures of final compounds were confirmed with the aid of IR, 1H NMR, 13C NMR spectroscopy and CHN analysis.
Patel, Rahul V.,Park, Se Won
p. 24 - 30
(2013/12/04)

A facile and efficient synthesis of 2-(5-(4-substitutedphenyl)-4, 5-dihydro-3-phenylpyrazol-1-yl)-6-substitutedbenzothiazoles and their biological studies
A series of new 1-substituted 3, 5-diarylpyrazolines (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25) were synthesized in good yield by both conventional and microwave-assisted synthesis from α, β- unsaturated ketones (6, 7, 8, 9) in n-butanol and benzothiazole hydrazines (2, 3, 4, 5). All the new compounds were characterized by IR, NMR, and mass spectral data. The synthesized compounds (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25) were evaluated for antibacterial and anthelmintic activities. The compounds showed potent anthelmintic activity against earthworm species (Eudrilus eugeniae) and moderate antibacterial activity against bacterial strains such as Gram positive bacteria, Enterococcus faecalis, Staphylococcus aureus, and Bacillus subtilis, and Gram negative bacteria, Escherichia coli and Proteus mirabilis.
Munirajasekhar,Himaja,Mali, Sunil V.
p. 459 - 465
(2014/04/17)

Different heterocycles functionalized s-triazine analogues: Design, synthesis and in vitro antimicrobial, antituberculosis, and anti-HIV assessment
Some new quinolone condensed s-triazine derivatives endowed with different heterocycles and 4-aminobenzonitrile moiety has been synthesized and examined for their bioactivities against eight bacteria (Staphylococcus aureus, Bacillus cereus, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Salmonella typhi, Proteus vulgaris, and Shigella flexneri), two fungi (Aspergillus niger, Candida albicans) by using agar streak dilution method, and Mycobacterium tuberculosis H37Rv by using Lowenstein and Jensen MIC method. Upon preliminary biological screening, it was observed that the majority of the compounds were found to possess a significant broad spectrum antimicrobial (MICs: 6.25-25 μg/mL) and antitubercular (MIC: 12.5 μg/mL) potential. Hence, anti-HIV activity against two types of HIV viral strains [HIV-1 (IIIB) and HIV-2 (ROD)] has been carried out using the MTT assay. From this bioassay, we have identified some potent inhibitors acting as anti-HIV-1 agents (IC50: 4.45g/mL) with promising therapeutic index of 16 for analogue 7 h. The structural assignments of the new products were carried out on the basis of IR, 1HNMR, 13CNMR spectroscopy, and elemental analysis.
Patel, Paresh K.,Patel, Rahul V.,Mahajan, Dharmesh H.,Parikh, Parimal A.,Mehta, Girish N.,Pannecouque, Christophe,De Clercq, Erik,Chikhalia, Kishor H.
p. 1641 - 1658
(2015/01/09)

Synthesis, cytotoxic evaluation, and in silico studies of substituted N-alkylbromo-benzothiazoles
In efforts to develop a new class of anticancer agents with improved efficacy and selective action, a series of N-alkylbromo-benzothiazoles were synthesized and evaluated for in vitro cytotoxic activity against various human cancer cell lines such as lung (A-549), prostate (PC-3), leukemia (THP-1), and colon (Caco-2). They were found to be highly active against prostate (PC-3) and leukemia (THP-1) cancer cells, moderately active against colon (Caco-2) cancer cells and less active against lung (A-549) cancer cells. Of the 12 compounds, two (11d, 11j) exhibit IC50 values of ≤ 1 μM against leukemia (THP-1) cancer cell lines. Compound 11l showed significant cytotoxic activity against the PC-3 (IC50 = 0.6 μM), THP-1 (IC50 = 3 μM) and Caco-2 cell lines (IC50 = 9.9 μM), respectively. Docking study of the synthesized ligand was done on epidermal growth factor receptor using ArgusLab flexible docking, to determine their observed activity. Further QSAR investigations with stepwise multiple linear regression analysis were applied to find correlation between various physicochemical parameters and anticancer activity. The QSAR results showed that anticancer activity could be modeled with descriptors. The predictive ability of models was cross-validated by observation of the low residual activity values and adjusted coefficient of variation (radj2) obtained by leave-one-out technique.
Gill, Rupinder Kaur,Singh, Gagandeep,Sharma, Anuradha,Bedi,Saxena
p. 4211 - 4222
(2013/09/02)

Synthesis of substituted benzo[d]thiazol-2-ylcarbamates as potential anticonvulsants
A series of substituted benzo[d]thiazol-2-ylcarbamates 4a-g and 5a-g were synthesized and evaluated for anticonvulsant activity. The structures of the synthesized compounds were confirmed on the basis of their physical and spectral data. The compounds were evaluated for anticonvulsant activity using PTZ-induced convulsion and maximal electroshock models. The target compounds have shown significant activity in these models.
Navale, Ashvini,Pawar, Smita,Deodhar, Meenakshi,Kale, Amol
p. 4316 - 4321
(2013/09/02)

Metal-free synthesis of 2-aminobenzothiazoles via aerobic oxidative cyclization/dehydrogenation of cyclohexanones and thioureas
A metal-free process for the synthesis of 2-aminobenzothiazoles from cyclohexanones and thioureas has been developed using catalytic iodine and molecular oxygen as the oxidant under mild conditions. Various 2-aminobenzothiazoles, 2-aminonaphtho[2,1-d]thiazoles, and 2-aminonaphtho[1,2-d] thiazoles were prepared via this method in satisfactory yields.
Zhao, Jinwu,Huang, Huawen,Wu, Wanqing,Chen, Huoji,Jiang, Huanfeng
supporting information
p. 2604 - 2607
(2013/07/11)

Synthesis of coumarin-based 1,3,4-oxadiazol-2ylthio-N-phenyl/benzothiazolyl acetamides as antimicrobial and antituberculosis agents
In an attempt to find new agents to fight against microbial infections, a series of coumarin-based 1,3,4-oxadiazol-2ylthio-N-phenyl/benzothiazolyl acetamides was synthesized starting from coumarin-3-carboxylic acid ethyl ester obtained through Knoevenagel and Pinner reaction. In vitro antimicrobial activity against several bacteria (S. aureus, B. cereus, E. coli, P. aeruginosa, K. pneumoniae, S. typhi, P. vulgaris, S. flexneri), fungi (A. niger, A. fumigatus, A. clavatus, C. albicans) and antimycobacterial activity against Mycobacterium tuberculosis H37Rv strain was assessed. This study shows to what extent the presence of various electron withdrawing/donating substituents on the phenyl or benzothiazole ring affects the activity profiles of the newer molecules. The relationship between activity profiles (MICs, 3.12-25 μg/mL) and the lipophilic character (LogP) of the prepared products is also discussed and the MIC values of the active conjugates seem to correlate to some extent with the lipophilicity profiles. Two (5e and 6c) of the final analogues displayed promising antimycobacterial activity at 12.5 μg/mL of MIC, half fold potent to the standard drug pyrazinamide (6.25 μg/mL). Compounds were characterized by IR, 1H NMR, 13C NMR spectroscopy and elemental analysis.
Patel, Rahul V.,Kumari, Premlata,Rajani, Dhanji P.,Chikhalia, Kishor H.
p. 195 - 210
(2013/03/13)

Synthesis and spectral properties of some azo disperse dyes containing a benzothiazole moiety
A known method was employed for the preparation of four substituted benzothiazole amines I-IV in moderate yields. These heterocyclic amines were diazotized with nitorsyl sulfuric acid and subsequently coupled with N,N-diethyl aniline and N-phenyl-2, 2′-iminodiethanol to afford heteroarylazo amine dyes 1-8 in satisfactory yields. These dyes were characterized by UV-Visible, FT-IR, 1H NMR, and elemental analysis techniques. The solvatochromism behavior of the azo compounds is investigated by studying their spectra in pure and mixed organic solvents of different characteristics. The color of the dyes is discussed with respect to the nature of the heterocyclic ring and substituent present therein. In addition, effects of acid and base on the visible absorption maxima of the dyes are also reported.
Moradi Rufchahi,Yousefi, Hessamoddin,Mohammadinia, Mojgan
p. 173 - 177
(2013/11/19)

Synthesis and biological evaluation of novel benzothiazole clubbed fluoroquinolone derivatives
In the present investigation, synthesis and anti-bacterial, analgesic and anthelmintic evaluation of a novel series of fluoroquinolone derivatives clubbed with benzothiazole moeity has been described. The synthesized compounds were characterised by spectral analysis (IR and H NMR). Preliminary results indicated that the most of the synthesized compounds demonstrated good activities against gram negative and gram positive bacterial strains. Compounds 5a, 5b, 5f and 5k demonstrated potent anti-bacterial activities. Compound 5a exhibited most potent anti-bacterial activity with MIC values of 04, 03, 08 and 15 μg/ mL against B. subtilis, S. aureus, E. coli and P. aeruginosa. Analogs 5a, 5c, 5g and 5h showed promising anthelmintic activity against Eisemia foetida in a low concentration as compared to standard drug piperazine citrate with mean paralysis time ranging 22.60 ± 2.46 to 31.60 ± 3.07 min. All synthesized compounds depicted good in vivo analgesic activity with compound 5a exhibiting the most potent activity of 55.19% inhibition of writhing in comparison to the standard drug.
Sharma, Prabodh Chander,Kumar, Ravinder,Chaudhary, Monika,Sharma, Archana,Rajak, Harish
p. 1 - 10
(2013/05/08)

Design, synthesis and anticonvulsant evaluation of N-(benzo[d]thiazol-2- ylcarbamoyl)-2-methyl-4-oxoquinazoline-3(4H)-carbothioamide derivatives: A hybrid pharmacophore approach
Novel N-(benzo[d]thiazol-2-ylcarbamoyl)-2-methyl-4-oxoquinazoline-3(4H)- carbothioamide derivatives were synthesized and evaluation of their anticonvulsant effects was done using various models of experimental epilepsy. Initial anticonvulsant activities of the compounds were investigated using intraperitoneal (i.p.) maximal electroshock shock (MES), subcutaneous pentylenetetrazole (scPTZ) seizure models in mice. The quantitative assessment after oral administration in rats showed that the most active was 2-methyl-4-oxo-N-(6-(trifluoromethoxy)benzo[d]thiazol-2-ylcarbamoyl) quinazoline-3(4H)-carbothioamide (SA 24) with ED50 values of 82.5 μmol/kg (MES) and 510.5 μmol/kg (scPTZ). This molecule was more potent than phenytoin and ethosuximide which were used as reference antiepileptic drugs. To explain the possible mechanism for anticonvulsant action, some of the selected active compounds were subjected to GABA (γ-amino butyric acid) assay and AMPA ((S)-2-amino-3-(3-hydroxyl-5-methyl-4-isoxazolyl) propionic acid) induced seizure test.
Malik, Sachin,Bahare, Radhe Shyam,Khan, Suroor Ahmad
supporting information
p. 1 - 13
(2013/10/01)

Design of benzothiazole-1,3,4-thiadiazole conjugates: Synthesis and anticonvulsant evaluation
Various 2-[(6-substituted-1,3-benzothiazol-2-yl)amino]-N-[5-substituted- phenyl-1,3,4-thiadiazol-2-yl]acetamides were synthesized with a prospective exploration of "lead hopping", using pharmacophoric elements for in vivo anticonvulsant activity. This yielded three potent candidates (5i, 5t, and 5u) in the preliminary screening employing the maximal electroshock seizure (MES) and the subcutaneous pentylenetetrazole (scPTZ) test, showing minimal neurotoxicity. Their quantitative study indicated an increase of nearly 2-10 times for the MES test and 7- to 67-fold for the scPTZ test in the protective index, the keystone in drug discovery for anticonvulsant activity. Various 2-[(6-substituted-1,3-benzothiazol-2-yl)amino]-N-[5-substituted-phenyl-1,3, 4-thiadiazol-2-yl]acetamides were synthesized with a prospective exploration of "lead hopping", using pharmacophoric elements for in vivo anticonvulsant activity. Three potent candidates (5i, 5t, and 5u) with minimal neurotoxicity were identified in the MES and scPTZ tests.
Siddiqui, Nadeem,Ahuja, Priya,Malik, Sachin,Arya, Satish K.
p. 819 - 831
(2013/12/04)

Novel 2-(2-benzylidenehydrazinyl)benzo[d]thiazole as potential antitubercular agents
Molecular hybridization approach was used to synthesize substituted 2-(2-(4-aryl oxy benzylidene) hydrazinyl)benzo thiazole derivatives with 2-hydrazinobenzothiazole and 4-(alicycli/aryl/biaryl/heteroaryl oxy)benzaldehyde as new anti-TB agents. The synthesized compounds, when tested against H37Rv strains of Mtb using Resazurin Microtitre Assay (REMA) method, showed promising activity (MIC 1.35-36.50μg/mL). 6-chloro-2-(2-(4- (pyridin-4-yloxy) benzylidene) hydrazinyl) benzo[d]thiazole (10v) gave MIC of 1.35 μg/mL. Thus making it, a potential lead could be developed for further antitubercular studies.
Bairwa, Vinod Kumar,Telvekar, Vikas N.
p. 244 - 247
(2013/07/28)

Synthesis of new N-[3-(Benzo[d]thiazol-2-yl)-4-methylthiazol-2(3H)-ylidene] substituted benzamides
A series of novel N -[3-(2-benzo[d]thiazol-2-yl)-4-methylthiazol-2(3H)- ylidene] substituted benzamides (2a-k) were efficiently synthesized by heterocyclization of the corresponding 1-(benzo[d]thiazol-2-yl)-3-aroylthioureas (1a{k). The cyclization was achieved by the reaction of α-bromoacteone produced in situ using bromine in dry acetone in the presence of triethylamine. TUeBITAK.
Saeed, Aamer,Rafique, Hummera
p. 909 - 916
(2013/12/04)