Reaction of chlorosulfonyl isocyanate with nitrones: an efficient method for the synthesis of cyclic enamides and 2h-pyrroles
作者:Sajan P. Joseph、D.N. Dhar
DOI:10.1016/s0040-4020(01)86028-2
日期:1988.1
Reaction of chlorosulfonyl isocyanate (CSI) with nitrones (derived from cyclic conjugated ketones), - and 3,4-dihydro-2H-pyrrole-1-oxides, -,-has been studied. Nitrones, -, react with CSI to form the enamidea, , -, and the cyclil-amide, , in yields ranging from 33 to 72 %. However, the 5,4-dihydro-2H-pyrrole-1-oxides, -, on reaction with CSI gave the 2H-pyrr-oles, -, in good yields. The 3,4-dihydr
研究了氯磺酰基异氰酸酯(CSI)与硝酮(衍生自环状共轭酮)和-和3,4-二氢-2H-吡咯-1-氧化物-的反应。硝酮,- ,与CSI反应以形成enamidea, ,- ,和cyclil酰胺,在产率范围为33至72%。然而,5,4二氢-2H-吡咯-1-氧化物,-在与CSI反应,得到2H-吡咯-OLES,- ,以良好产率。在相似的实验条件下,3,4-二氢-2H-吡咯-1-氧化物以40%的产率得到吡咯烷酮。已经用实验证据提出了上述重排和转化的合理机制。