摘要:
Reaction of acyclic (R(1-3)) and cyclic (R(4-5)) BMMA (=N-[bis-(methylthio)-methylene]-amino) reagents with Gewald-type thiophene derivatives (2, 3) led to annelation of pyrimidine moieties. Thus, linear thiazolo- or thiazino- and pyrrolo-, pyrido- or azepino-fused thiopyrano[4',3':4,5]thieno-[2,3-d]pyrimidines (5 and 6) as well as the angular imidazo-fused thiopyrano[4,'3':4,5]thieno-[2,3-d]pyrimidine 8 were easily obtained from one-pot reactions in good yields.