39842-01-8Relevant academic research and scientific papers
Iron-promoted one-pot approach: Synthesis of isothiocyanates
Pendem, Venkata Bhavanarushi,Nannapaneni, Madhavi
, p. 485 - 490 (2020/02/18)
We have established a facile and versatile synthesis for the construction of isothiocyanates from their respective amines in the presence of an eco-friendly, inexpensive, easily available Iron catalyst under mild conditions. This reaction provides the target products through the formation of thiocarbamate salt as an intermediate. Both aromatic amines and aliphatic amines provided the respective target products in moderate to high yield under optimized reaction conditions. However, electron withdrawing substituents were difficult to give target product at room temperature, whereas, they obtained final products in good yield at moderate temperature. In addition, mechanistic studies were revealed that the synthetic route involved iron based subsequent reactions of addition and removal of sulfur.
Synthesis and antitumor activity of novel pyridazinone derivatives containing 1,3,4-thiadiazole moiety
Qin, Junhu,Zhu, Mei,Zhu, Hongmei,Zhang, Liqiong,Fu, Yihong,Liu, Jiamin,Wang, Zhenchao,OuYang, Guiping
, p. 592 - 599 (2020/03/16)
A series of novel pyridazinone derivatives containing the 1,3,4-thiadiazole moiety were synthesized and characterized by 1H NMR, 13C NMR, spectroscopies HRMS and IR. Among them, the structure of compound 5c (2-(Tert-butyl)?4-chloro-5-((5-((2-ethylphenyl)amino)?1,3,4-thiadiazol-2-yl)thio)pyridazin-3(2H)-One) was unambiguously confirmed via single crystal X-ray diffraction analysis. The inhibitory activity of all the target compounds against MGC-803 and Bcap-37 was determined by MTT assay, with doxorubicin (the inhibition rates were 95.5 ± 0.4% and 95.7 ± 1.0% respectively) as a control. The preliminary results showed that the inhibitory activity of compound 5n (2-(Tert-butyl)?4-chloro-5-((5-((3-fluorophenyl)amino)?1,3,4-thiadiazol-2-yl)thio)pyridazin-3(2H)-One) was superior to the others. The inhibition rates of MGC-803 and Bcap-37 cells were 86.3 ± 2.2% and 92.3 ± 0.6% at a concentration of 10 μmol/L, respectively. The preliminary structure-activity relationship showed that when the 2-position of the benzene ring was substituted by a methyl group, such as compound 5j (2-(Tert-butyl)?4-chloro-5-((5-((2,3-dimethylphenyl)amino)?1,3,4-thiadiazol-2-yl)thio)pyridazin-3(2H)-One), it exhibited good anticancer activity on MGC-803 cells. Besides, introducing fluorine, chlorine, or trifluoromethyl group onto the benzene ring, such as compound 5 m (2-(Tert-butyl)?4-chloro-5-((5-((4-(trifluoromethoxy)phenyl)amino)?1,3,4-thiadiazol-2-yl)thio)pyridazin-3(2H)-One), displayed good anticancer activity on MGC-803 and Bcap-37 cells.
Design, computational studies, synthesis and biological evaluation of thiazole-based molecules as anticancer agents
Anuradha,Patel, Sagarkumar,Patle, Rajkumar,Parameswaran, Preethi,Jain, Alok,Shard, Amit
, p. 20 - 30 (2019/04/25)
Background: Abolition of cancer warrants effective treatment modalities directed towards specific pathways dysregulated in tumor proliferation and survival. The antiapoptotic Bcl-2 proteins are significantly altered in several tumor types which position them as striking targets for therapeutic intervention. Here we designed, computationally evaluated, synthesized, and biologically tested structurally optimized thiazole-based small molecules as anticancer agents. Methods: The virtually designed 200 molecules were subjected to rigorous docking and in silico ADME-Toxicity studies. Out of this, 23 skeletally diverse thiazole-based molecules which passed pan assay interference compounds (PAINS) filter and were synthetically feasible were synthesized in 3 steps using cheap and readily available reagents. The molecules were in vitro evaluated against Bcl-2-Jurkat, A-431 cancerous cell lines and ARPE-19 cell lines. Molecular Dynamics (MD) simulation studies were performed to analyse conformational changes induced by ligand 32 in Bcl-2. Flow cytometry analysis of compound 32 treated Bcl-2 cells was done to check apoptosis. Results: The molecules exhibited appreciable interactions with Bcl-2 and were having acceptable drug like properties as tested in silico. The multi step synthesis yielded 23 skeletally diverse thiazole-based molecules in up to 80% yield. The molecules simultaneously inhibited Bcl-2 Jurkat cells in vitro without causing detectable toxicity to normal cells (ARPE-19 cells). Among them molecules 32, 50, 53, 57 and 59 showed considerable activities against Bcl-2 Jurkat and A-431cell lines at concentrations ranging from 32–46 μM and 34–52 μM, respectively. The standard doxorubicin exhibited IC50 in Bcl-2 Jurkat and A-431cell lines at 45.87 μM and 42.37 μM, respectively. The molecule 32, almost equipotent in both the cell lines was subjected to molecular dynamics (MD) simulation with Bcl-2 protein (4IEH). It was shown that 32 interacted with protein majorly via hydrophobic interactions and few H-bonding interactions. Fluorescence-activated cell sorting (FACS) analysis established that molecule is dragging cancerous cells towards apoptosis. Discussion and conclusion: The chemical intuition was checked by computation coupled with biological results confirmed that thiazole-based hits have the potential to be developed downstream into potent and safer leads against antiapoptotic Bcl-2 cells.
Na2S2O8-mediated efficient synthesis of isothiocyanates from primary amines in water
Fu, Zhicheng,Yuan, Wenhao,Chen, Ning,Yang, Zhanhui,Xu, Jiaxi
, p. 4484 - 4491 (2018/10/17)
We have developed two green, practical, and efficient procedures, including a one-pot one, to synthesize isothiocyanates from amines and carbon disulfide via desulfurization with sodium persulfate. Water is used as the solvent. Basic conditions are necessary for good chemoselectivity for isothiocyanates. Structurally diverse linear and branched alkyl amines and aryl amines are readily converted to isothiocyanates by the two procedures in satisfactory yields. Halogens, benzylic C-H bonds, methylthio, nitro, ester, alkenyl, electron-rich or -deficient (hetero)aryls, acetylenyl, and even phenolic and alcoholic hydroxyls are well tolerated. The one-pot procedure in water can also be used to realize the preparation of chiral isothiocyanates from chiral amines, and the modification of bioactive structures with free amino groups. In large-scale preparation, simple and practical purification procedures independent of column chromatography are developed.
One-pot three-component tandem reaction: Synthesis of aryl/alkyl cyanamides libraries and their further conversion into tetrazole derivatives
Mandapati, Usharani,Mandapati, Pavan,Pinapati, Srinivasarao,Tamminana, Ramana,Rudraraju, Rameshraju
supporting information, p. 500 - 510 (2018/02/06)
We have developed methodology for the synthesis of aryl/alkyl cyanamides from amines in one-pot four steps reaction using cheap, readily available and air stable copper source as catalyst under mild reaction conditions. We have also studied the application of cyanamides. In this connection, we could construct aryl tetrazolamine from cyanamides using click reaction.
Copper promoted desulfurization towards the synthesis of isothiocyanates
Mandapati, UshaRani,Pinapati, Srinivasarao,Rudraraju, RameshRaju
, p. 125 - 128 (2016/12/26)
The cheap, readily available and air stable catalyst was used as the desulfurization agent for the conversion of aniline to isothiocyanates in one pot two step reaction under mild reaction conditions.
A novel one-pot synthesis of isothiocyanates and cyanamides from dithiocarbamate salts using environmentally benign reagent tetrapropylammonium tribromide
Kuotsu, Neivotsonuo Bernadette,Jamir, Latonglila,Phucho, Tovishe,Sinha, Upasana Bora
, p. 832 - 841 (2018/01/17)
A highly efficient and simple protocol for the synthesis of isothiocyanates and cyanamides from their respective amines in the presence of a mild, efficient, and non-toxic reagent tetrapropylammonium tribromide is described. High environmental acceptability of the reagents, cost effectiveness and high yields are the important attributes of this methodology.
Cobalt mediated by desulfurization toward the synthesis of isothiocyanates
Seelam, Mohan,Shaik, Bajivali,Kammela, Prasada Rao
supporting information, p. 1759 - 1765 (2016/10/31)
A highly efficient and simple protocol for the construction of aromatic and aliphatic isothiocyanates from their respective amines in the presence of cheap, readily available, and air-stable cobalt catalyst is described. All reactions were carried out under optimized reaction conditions and gave target products in good to excellent yields within shorter reaction time.
Synthesis of 4-phenylthieno[2, 3-e][1, 2, 4]triazolo[4, 3-a]pyrimidine-5 (4H)-one derivatives and evaluation of their anti-inflammatory activity
Pan, Fu-Jun,Wang, Shi-Ben,Liu, Da-Chuan,Gong, Guo-Hua,Quan, Zhe-Shan
, p. 141 - 148 (2016/03/12)
A series of 4-phenylthieno[2, 3-e][1, 2, 4]triazolo[4, 3-a]pyrimidine-5 (4H)-ones (5a-p) with triazole or other heterocyclic substituents (6-11) was synthesized and the compounds were evaluated for their anti-inflammatory activity using the xylene-induced ear-edema test. Pharmacological analyses showed that the compound 4- (4-chlorophenyl)thieno[2, 3-e][1, 2, 4]triazolo[4, 3-a]pyrimidine- 5 (4H)-one (5m) exhibited the greatest anti-inflammatory activity (50.48% inhibition, 30 min after intraperitoneal administration) and was more potent than the reference drug, indomethacin. The peak activity of 5m was observed 4 h after oral administration, and it showed a higher anti-inflammatory activity than indomethacin did at a dose of 100 mg/kg.
An efficient methodology for the synthesis of thioureas from amine mediated by a cobalt source
Seelam, Mohan,Shaikh, Baji Vali,Tamminana, Ramana,Kammela, Prasada Rao
supporting information, p. 5297 - 5300 (2016/11/11)
The cheap, readily available and air stable cobalt catalyst was used as the desulfurization agent for the conversion of aniline to thioureas in one pot three step reaction under mild reaction conditions. The reactions are rapid and facile and accomplished at room temperature.
