PREPARATION OF NEW NITROGEN-BRIDGED HETEROCYCLES. 68. ONE-POT SYNTHSIS OF 4-SUBSTITUTED 5-ACYLTHIENO[3,2-d]THIAZOLE DERIVATIVES

[摘要]：The reactions of 5-acyl-3-(1-pyridinio)thiophene-2-thiolates with dimethyl acetylenedicarboxylate in xylene at the reflux temperature afforded the corresponding 2-unsubstituted 5-acylthieno[3,2-d]thiazoles in 25-69% yields together with dimethyl phthalate as another fragmentation product. In a few reactions, the unexpected products, dimethyl 2-[2-acylthieno[2',3':2,3]-1,4-thiazino[4,5-a]pyrrol-8-ylidene]succinat e derivatives, were also isolated, though their yields were very low.

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