Hydrochloric Acid → 5-oxo-5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylic acid

Participants

Reaction Steps

A mixture of ethyl 5-oxo-5H-thiazolo[3,2-a]pyrimidine-6-carboxylate (11.2g., 50mM) and 2N hydrochloric acid (75ml) was heated under reflux for 5 hours. The reaction mixture was cooled and filtered to give the required product in 79.7% weight yield (7.81g). νmax (KBr disc) 1720 (acid C=O)cm-1 ; λmax (NaHCO3 solution) 232nm (εm 2650), 263nm (εm 2030), 328nm (εm 6000) and 339nm (εm 5400); (Found: C, 43,65; H, 2.26; N, 14.16; S, 16.62%. C7H4N2O3S requires C, 43.87; H, 2.06; N, 14.28; S, 16.32%.

Provenance & Evidence