A Novel Approach to Pyrrolo[2,1-b]thiazoles
5-Aroyl-2-(dimethylamino)methylidene-2,3-dihydro-3-oxopyrrolo[2,1-b]thiazole-7-carboxylic acid esters, -7-carbonitriles and corresponding 7-hetaryl substituted derivatives were prepared. Thus, the substituted acetonitriles (XCH2CN, where X = CO2R, CN, hetaryl) were treated with mercaptoacetic acid yielding 2-(X-methylidene)thiazolidin-4-ones, which were N-alkylated with phenacyl bromides. Further formylation of the obtained compounds with excess of DMF•POCl3 complex led to the above mentioned pyrrolo[2,1-b]thiazoles.
Tverdokhlebov A. V.; Resnyanska E. V.; Tolmachev A. A.; Andrushko A. P.
Synthesis 2003, 17, 2632-2638