Synthesis of Fused Thiazolothienopyrimidines. -2-Allylthio-and 2-propynylthiothienopyrimidinones (III) cyclize on treatment with electrophilic reagents to furnish thiazolothieno[2,3-d]-[cf. (IV), (V)] or thiazolothieno[2,3e]pyrimidinones [cf. (VI), (VII)] depending on the nature of the electrophile. Plausible mechanisms for the different cyclization pathways are proposed. -(VAS'KEVICH, R. I.; KHRIPAK, S. M.; STANINETS, V. I.; ZBOROVSKII, YU. L.; CHERNEGA, A. N.; Russ.
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