Vk. Ahluwalia et al., NOVEL SYNTHESIS OF THIENO[2,3-C]PYRAZOLES AND THIENO[2,3-D]PYRIMIDINES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 35(7), 1996, pp. 715-717
Chloro-4-formyl-3-substitued-1-phenyl-1H-pyrazoles (1a-c) and 1, 3-dia
ryl-6-chloro-5-formyl-1, 3-dihydro-4-oxo-2-thioxopyrimidines (2a-f) on
condensation with methyl thioglycolate furnish the corresponding meth
yl l-1-phenyl-1H-thieno[2,3-c]pyrazole-5-carboxylates (4a-c) and methy
l 1,3-diaryl-1, 3-dihydro-4-oxo-2-thioxothieno[2, 3-d]pyrimidine-6-car
boxylates (5a-f) in excellent yields.