Cycloaddition of C,N-diarylnitrones to 2-butenolide : Synthesis of 2,3,6,6a-tetrahydrofuro[3,4-] isoxazol-4 (3a)-one
作者:Avijit Banerji、Sebanti Basu
DOI:10.1016/0040-4020(92)85009-4
日期:1992.1
The cycloadditions of four C,N-diaryl nitrones (1–4) to the 5-membered conjugated lactone 2-butenolide were investigated. Two stereoisomeric 2-phenyl-3-aryl-2,3,6,6a-tetrahydrofuro[3,4-]-isoxazol-4(3a)-one cycloadducts and a ring-opened butanolide derivative were obtained in each case. The structure and stereochemistry of the products were determined by detailed NMR studies. The regiochemical course