- Dibenzazepine-linked isoxazoles: New and potent class of α-glucosidase inhibitors
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α-Glucosidase inhibition is a valid approach for controlling hyperglycemia in diabetes. In the current study, new molecules as a hybrid of isoxazole and dibenzazepine scaffolds were designed, based on their literature as antidiabetic agents. For this, a series of dibenzazepine-linked isoxazoles (33–54) was prepared using Nitrile oxide-Alkyne cycloaddition (NOAC) reaction, and evaluated for their α-glucosidase inhibitory activities to explore new hits for treatment of diabetes. Most of the compounds showed potent inhibitory potency against α-glucosidase (EC 3.2.1.20) enzyme (IC50 = 35.62 ± 1.48 to 333.30 ± 1.67 μM) using acarbose as a reference drug (IC50 = 875.75 ± 2.08 μM). Structure-activity relationship, kinetics and molecular docking studies of active isoxazoles were also determined to study enzyme-inhibitor interactions. Compounds 33, 40, 41, 46, 48–50, and 54 showed binding interactions with critical amino acid residues of α-glucosidase enzyme, such as Lys156, Ser157, Asp242, and Gln353.
- Umm-E-Farwa,Ullah, Saeed,Khan, Maria Aqeel,Zafar, Humaira,Atia-tul-Wahab,Younus, Munisaa,Choudhary, M. Iqbal,Basha, Fatima Z.
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supporting information
(2021/05/10)
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- Synthesis and SAR study of simple aryl oximes and nitrofuranyl derivatives with potent activity against Mycobacterium tuberculosis
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Background: Oximes and nitrofuranyl derivatives are particularly important compounds in medicinal chemistry. Thus, many researchers have been reported to possess antibacterial, antiparasitic, insecticidal and fungicidal activities. Methods: In this work, we report the synthesis and the biological activity against Mycobacterium tuberculosis H37RV of a series of fifty aryl oximes, ArCH=N-OH, I, and eight nitrofuranyl compounds, 2-nitrofuranyl-X, II. Results: Among the oximes, I: Ar = 2-OH-4-OH, 42, and I: Ar = 5-nitrofuranyl, 46, possessed the best activity at 3.74 and 32.0 μM, respectively. Also, 46, the nitrofuran compounds, II; X = MeO, 55, and II: X = NHCH2Ph, 58, (14.6 and 12.6 μM, respectively), exhibited excellent biological activities and were non-cytotoxic. Conclusion: The compound 55 showed a selectivity index of 9.85. Further antibacterial tests were performed with compound 55 which was inactive against Enterococcus faecalis, Klebisiella pneumonae, Pseudomonas aeruginosa, Staphylococcus aureus, Salmonella typhymurium and Shigel-la flexneri. This study adds important information to the rational design of new lead anti-TB drugs. Structure-activity Relationship (SAR) is reported.
- Calixto, Stephane Lima,Carvalho, Guilherme da Silva Louren?o,Coimbra, Elaine Soares,Granato, Juliana da Trindade,Louren?o, Maria Cristina da Silva,Wardell, James,da Costa, Cristiane Fran?a,de Souza, Marcus Vinicius Nora
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- Diversity Oriented Clicking (DOC): Divergent Synthesis of SuFExable Pharmacophores from 2-Substituted-Alkynyl-1-Sulfonyl Fluoride (SASF) Hubs
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Diversity Oriented Clicking (DOC) is a unified click-approach for the modular synthesis of lead-like structures through application of the wide family of click transformations. DOC evolved from the concept of achieving “diversity with ease”, by combining classic C?C π-bond click chemistry with recent developments in connective SuFEx-technologies. We showcase 2-Substituted-Alkynyl-1-Sulfonyl Fluorides (SASFs) as a new class of connective hub in concert with a diverse selection of click-cycloaddition processes. Through the selective DOC of SASFs with a range of dipoles and cyclic dienes, we report a diverse click-library of 173 unique functional molecules in minimal synthetic steps. The SuFExable library comprises 10 discrete heterocyclic core structures derived from 1,3- and 1,5-dipoles; while reaction with cyclic dienes yields several three-dimensional bicyclic Diels–Alder adducts. Growing the library to 278 discrete compounds through late-stage modification was made possible through SuFEx click derivatization of the pendant sulfonyl fluoride group in 96 well-plates—demonstrating the versatility of the DOC approach for the rapid synthesis of diverse functional structures. Screening for function against MRSA (USA300) revealed several lead hits with improved activity over methicillin.
- Barrow, Andrew S.,Cheng, Yunfei,Gialelis, Timothy L.,Giel, Marie-Claire,Kitamura, Seiya,Li, Gencheng,Moses, John E.,Ottonello, Alessandra,Sharpless, K. Barry,Smedley, Christopher J.,Wolan, Dennis W.
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supporting information
p. 12460 - 12469
(2020/06/10)
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- A Transition-Metal-Free One-Pot Cascade Process for Transformation of Primary Alcohols (RCH2OH) to Nitriles (RCN) Mediated by SO2F2
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A new transition-metal-free one-pot cascade process for the direct conversion of alcohols to nitriles was developed without introducing an “additional carbon atom”. This protocol allows transformations of readily available, inexpensive, and abundant alcohols to highly valuable nitriles.
- Jiang, Ying,Sun, Bing,Fang, Wan-Yin,Qin, Hua-Li
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p. 3190 - 3194
(2019/05/21)
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- Cascade Process for Direct Transformation of Aldehydes (RCHO) to Nitriles (RCN) Using Inorganic Reagents NH2OH/Na2CO3/SO2F2 in DMSO
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A simple, mild, and practical process for direct conversion of aldehydes to nitriles was developed feathering a wide substrate scope and great functional group tolerability (52 examples, over 90% yield in most cases) using inorganic reagents (NH2OH/Na2CO3/SO2F2) in DMSO. This method allows for transformations of readily available, inexpensive, and abundant aldehydes to highly valuable nitriles in a pot, atom, and step-economical manner without transition metals. This protocol will serve as a robust tool for the installation of cyano-moieties to complicated molecules.
- Fang, Wan-Yin,Qin, Hua-Li
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p. 5803 - 5812
(2019/05/14)
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- SUBSTITUTED 2-HETEROCYCLYLIMIDAZOLYLCARBOXAMIDES AS PESTICIDES
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The present invention relates to compounds of the general formula (I) in which Q, V, T, W, Y, X and A have the meanings given in the description—and to a process for preparation thereof and to the use thereof for controlling animal pests.
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Paragraph 0672-0673
(2019/06/14)
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- 7-Oxa-4-thia-1-aza-bicyclo[3.2.1]octane 4,4-Dioxides: Mechanochemical Synthesis by Tandem Michael Addition–1,3-Dipolar Cycloaddition of Aldoximes and Evaluation of Antibacterial Activities
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A solvent-free, green, and efficient mechanochemical method for the synthesis of a series of bridged bicyclo aza-sulfone derivatives, namely 7-oxa-4-thia-1-aza-bicyclo[3.2.1]octane 4,4-dioxides through tandem Michael addition–1,3-dipolar cycloaddition of aldoximes was developed. Mechanochemical grinding/milling facilitates quick formation of aldoximes from corresponding aldehydes and hydroxylamine, which upon reaction with divinyl sulfone in a mixer mill affords 7-oxa-4-thia-1-aza-bicyclo[3.2.1]octane 4,4-dioxide derivatives in good overall yields. The newly synthesized bicyclo aza-sulfone derivatives 4 were screened for antibacterial activities. Mostly bicyclo aza-sulfones derived from electron-rich aromatic aldehydes inhibit the growth of Mycobacterium smegmatis (mc2155) and those from aliphatic aldehydes the growth of Escherichia coli (DH5α) in moderate to good effect. However, butyraldehyde-derived compound 4r was very effective against both M. smegmatis and E. coli. The key advantages of this mechanochemical method are catalyst- and solvent-free conditions, shorter reaction time, and formation of a new series of 7-oxa-4-thia-1-aza-bicyclo[3.2.1]octane 4,4-dioxide derivatives, which are good antibacterial agents against M. smegmatis and E. coli.
- Bhutia, Zigmee T.,Das, Avijit,Biswas, Malabika,Chatterjee, Amrita,Banerjee, Mainak
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p. 506 - 514
(2018/02/09)
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- 2,4-DIAMINO-6-ETHYLPYRIMIDINE DERIVATIVES WITH ANTIMALARIAL ACTIVITIES AGAINST PLASMODIUM FALCIPARUM
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The present invention relates to 2,4-diamino-6-ethylpyrimidine derivatives that are inhibitors of wild type and quadruple mutant dihydrofolate reductase (DHFR) of Plasmodium falciparum. They also show in vitro antimalarial activities against Plasmodium fa
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Page/Page column 12
(2017/04/11)
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- Synthesis of 3,5-Disubstituted isoxazoles containing privileged substructures with a diverse display of polar surface area
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We designed and synthesized the molecular framework of 3,5-disubstituted isoxazoles containing privileged substructures with various substituents which uniquely display polar surface area in a diverse manner. A library of 3,5-disubstituted isoxazoles were systematically prepared via 1,3-dipolar cycloaddition of alkynes with nitrile oxides prepared by two complementary synthetic routes; method A utilized a halogenating agent with a base and method B utilized a hypervalent iodine reagent. Through the biological evaluation of corresponding isoxazoles via three independent phenotypic assays, the different pattern of biological activities was shown according to the type of privileged substructure and substituent. These results demonstrated the significance of molecular design via introducing privileged substructures and various substituents to make a diverse arrangement of polar surface area within a similar 3-dimensional molecular framework.
- Kim, Mingi,Hwang, Yoon Soo,Cho, Wansang,Park, Seung Bum
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supporting information
p. 407 - 413
(2017/06/19)
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- Antiprotozoal activity of dicationic 3,5-diphenylisoxazoles, their prodrugs and aza-analogues
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Fifty novel prodrugs and aza-analogues of 3,5-bis(4-amidinophenyl)isoxazole and its derivatives were prepared. Eighteen of the 24 aza-analogues exhibited IC50 values below 25 nM against Trypanosoma brucei rhodesiense or Plasmodium falciparum. S
- Patrick, Donald A.,Bakunov, Stanislav A.,Bakunova, Svetlana M.,Wenzler, Tanja,Brun, Reto,Tidwell, Richard R.
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p. 559 - 576
(2014/01/17)
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- AZOLINE COMPOUNDS FOR COMBATING INVERTEBRATE PESTS
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The present invention relates to azoline compounds which are useful for combating or controlling invertebrate pests, in particular arthropod pests and nematodes. The invention also relates to a method for controlling invertebrate pests by using these comp
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Page/Page column 245
(2011/07/07)
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- Novel Isoxazoles and Methods of Use Thereof
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The invention relates to isoxazole derivatives, compositions comprising such compounds, and methods of preventing or treating conditions and disorders using such compounds and compositions.
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Page/Page column 9; 12
(2009/12/24)
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- Regio- and stereochemistry of [2 + 2] photocycloadditions of imines to alkenes: A computational and experimental study
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(Chemical Equation Presented) The [2 + 2] photocycloaddition of isoxazolines to alkenes has been studied by means of CASPT2/6-31G*// CASSCF/6-31G*. The reaction outcome is influenced by the relative ratio of imine deactivation and photocycloaddition. Anal
- Sampedro, Diego,Soldevilla, Alberto,Campos, Pedro J.,Ruiz, Roberto,Rodriguez, Miguel A.
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scheme or table
p. 8331 - 8336
(2009/04/11)
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- Synthesis and in vitro antiprotozoal activities of dicationic 3,5-diphenylisoxazoles
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3,5-Bis(4-amidinophenyl)isoxazole (3) - an analogue of 2,5-bis(4- amidinophenyl)furan (furamidine) in which the central furan ring is replaced by isoxazole - and 42 novel analogues were prepared by two general synthetic pathways. The 43 isoxazole derivati
- Patrick, Donald A.,Bakunov, Stanislav A.,Bakunova, Svetlana M.,Kumar, E.V.K. Suresh,Lombardy, Richard J.,Jones, Susan Kilgore,Bridges, Arlene S.,Zhirnov, Oksana,Hall, James Edwin,Wenzler, Tanja,Brun, Reto,Tidwell, Richard R.
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p. 2468 - 2485
(2008/02/03)
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- Design, synthesis and structure-activity relationships of benzoxazinone-based factor Xa inhibitors
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A series of benzoxazinone derivatives was designed and synthesized as factor Xa inhibitors. We demonstrated that the naphthyl moiety in the aniline-based compounds 1 and 2 can be replaced with benzene-fused heterobicycles and biaryls to give factor Xa inh
- Huang, Wenrong,Zhang, Penglie,Zuckett, Jingmei F.,Wang, Lingyan,Woolfrey, John,Song, Yonghong,Jia, Zhaozhong J.,Clizbe, Lane A.,Su, Ting,Tran, Katherine,Huang, Brian,Wong, Paul,Sinha, Uma,Park, Gary,Reed, Andrea,Malinowski, John,Hollenbach, Stanley J.,Scarborough, Robert M.,Zhu, Bing-Yan
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p. 561 - 566
(2007/10/03)
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- Bisbenzamidine isoxazoline derivatives as factor Xa inhibitors
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Factor Xa is an important serine protease in the blood coagulation cascade. It generates thrombin and holds the central position that links the intrinsic and extrinsic activation mechanism in the final common pathway of coagulation. Therefore, inhibition
- Quan,Pruitt,Ellis,Liauw,Galemmo Jr.,Stouten,Wityak,Knabb,Thoolen,Wong,Wexler
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p. 2813 - 2818
(2007/10/03)
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