A facile 1,3-dipolar cycloaddition of azomethine ylides to 2-arylidene-1,3-indanediones: synthesis of dispiro-oxindolylpyrrolothiazoles and their antimycobacterial evaluation.

A facile 1,3-dipolar cycloaddition of azomethine ylide generated in situ from the reaction of 1,3-thiazolane-4-carboxylic acid and isatin to 2-arylidene-1,3-indanediones furnished novel dispiro-oxindolylpyrrolothiazoles regio- and stereo-selectively in moderate to good yields (60-92%). In vitro antitubercular screening of 27 compounds against Mycobacterium tuberculosis H37Rv (MTB) disclosed that spiro[5.3']-5'-nitrooxindolespiro-[6.

A regio- and stereoselective 1,3-dipolar cycloaddition for the synthesis of novel spiro-pyrrolothiazolyloxindoles and their antitubercular evaluation.

The 1,3-dipolar cycloaddition of azomethine ylides derived from substituted isatins and 1,3-thiazolane-4-carboxylic acid to a series of 2-(arylmethylene)-2,3-dihydro-1H-inden-1-ones afforded twenty nine novel spiro-pyrrolothiazolyloxindoles regio- and stereoselectively in moderate yields. These compounds were screened for their in vitro activity against Mycobacterium tuberculosis H37Rv (MTB) using agar dilution method. Among 29 compounds screened, spiro[5.

A microwave-assisted, facile, regioselective Friedländer synthesis and antitubercular evaluation of 2,9-diaryl-2,3-dihydrothieno-[3,2-b]quinolines.

A series of 2,9-diaryl-2,3-dihydrothieno[3,2-b]quinolines have been synthesized regioselectively by Friedländer annulation of 5-aryldihydro-3(2H)-thiophenones and 2-aminobenzophenones in the presence of trifluoroacetic acid in good yields under microwave irradiation at 100 degrees C. The 2,9-diaryl-2,3-dihydrothieno[3,2-b]quinolines were screened for in vitro antimycobacterial activity against Mycobacterium tuberculosis H37Rv (MTB) and multi-drug resistant M. tuberculosis (MDR-TB).