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Methyl thieno[2,3-b]quinoline-2-carboxylates 51 were prepared in 70–80% yield by reaction of ketone 49 with methyl 2-mercaptoacetate in DMF containing anhydrous K2CO3 followed by cyclization in methanol containing piperidine. Compounds 49 were condensed with aromatic aldehyde to give the corresponding chalcones 52. The latter compounds were cyclocondensed with hydrazine to produce pyrazoles 53 (Scheme 15) .
Trimethylolpropane tris(2- mercaptoacetate.
????:Mercaptoacetic acid 2-Mercaptoacetate.