Synthesis and antimicrobial evaluation of some new fluorinated spiro[[1,5] -benzothiazepin-2,3′[3′H]-indol]-2′(1′H)-ones

Montmorillonite Catalysed Synthesis of Novel Spiro[3H-Indole-3,3′- [3H-1,2,4] Triazol]-2(1H) Ones in Dry Media under Microwave Irradiation

A new route for the one pot synthesis of novel spiro[3H-indole-3,3′-[3H-1,2,4] triazol]-2 (1H) ones utilizing 3-arylimino-2H-indol-2-ones (3) and thiosemicarbazide (4) as starting material under microwave irradiation is reported. Complete conversion was observed by TLC which also showed the formation of a single product.

Evaluation of structurally diverse benzoazepines clubbed with coumarins as Mycobacterium tuberculosis agents

Tuberculosis caused by Mycobacterium tuberculosis remains a leading cause of mortality worldwide into 21st century. In continuation with our anti-tuberculosis research programme, in this work, we have prepared molecularly diverse coumarins clubbed with benzothiazepines as well as its aza-analogues-benzodiazepines by molecular hybridization. The resulting compounds were screened for their M. tuberculosis activity against H(37) Rv strains using microplate alamar blue assay. Among the designed diversity, the compounds 5k, 5n and 5o were found significantly active in primary anti-tuberculosis assay at minimum inhibitory concentration <6.25 μm. Moreover, the IC(50) values of 5k and 5o in level-2 screening were observed as >10 μg/mL and 3.63 μg/mL, respectively. Design and synthesis of more focused library and its three-dimensional quantitative structure activity relationship analysis are underway.

Facile One Pot Microwave Induced Solvent-Free Synthesis and Antifungal, Antitubercular Screening of Spiro [1,5]-Benzothiazepin-2,3'[3'H]indol-2[1'H]-ones

Microwave activation coupled with dry media technique as a green chemistry procedure has been applied to synthesis of a series of some new title compounds. They have been obtained by the reaction of in situ synthesized 1,3-dihydro-3-[2-(phenyl/4-fluorophenyl)-2-oxoethylidene)-indol-2(1H)-one (4a, b) with substituted aminobenzenethiols (5a-d). The key intermediates 4a, b were also prepared in one step by this improved technique by reacting isatin and substituted acetophenones (2a, b). The results obtained under microwave irradiation when compared with that following conventional method demonstrate the versatility of the process. The title compounds 7a-e have also been screened for their antifungal and antitubercular activity, 7a and 7e showing maximum inhibition of growth of Alternaria alternata and Fusarium oxysporium and 7b, c, e revealing significant antitubercular activity.