Influence of ring size on the outcome of sulfide contraction reactions with thiolactams. Isolation of bicyclic ketene S,N-acetals and thioisomünchnones
作者:Joseph P. Michael、Charles B. de Koning、Christiaan W. van der Westhuyzen、Manuel A. Fernandes
DOI:10.1039/b103560f
日期:——
Reaction between diethyl bromomalonate and 3-phenylpyrrolidine-2-thione yielded a vinylogous urethane by the Eschenmoser sulfide contraction. However, with 3-substituted piperidine-2-thiones, sulfur was retained in the products, and a range of bicyclic heterocycles, including bicyclic keteneS,N-acetals (2-alkylidene-1,3-thiazolidin-4-ones) and stable thioisomünchnones, was isolated. A novel dimeric