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 ketene S,N-acetals (2-alkylidene-1,3-thiazolidin-4-ones) and stable thioisomünchnones, was isolated. A novel dimeric
之间的反应 溴丙二酸二乙酯 和 3-苯基吡咯烷-2-硫酮通过Eschenmoser硫化物收缩产生乙烯基的氨基甲酸酯。然而,在3-取代的哌啶-2-硫酮中,硫保留在产物中,并形成了一系列双环杂环,包括双环烯酮S,N-乙缩醛(2-亚烷基-1,3-噻唑烷酮-4-酮)和分离出稳定的thioisomünchnones。一种新型的二聚乙烯酮S,N-乙缩醛的特征在于X射线晶体学。