A facile method for the preparation of 4-hydroxy-Δ2-isoxazolines via a cycloaddition/oxidation procedure employing nitrile oxides and vinylboronic esters
作者:Richard H. Wallace、Jinchu Liu
DOI:10.1016/s0040-4039(00)78326-2
日期:1994.10
The 1,3-dipolar cycloaddition of aromatic nitrile oxides with trans-1,2-disubstituted vinylboronic esters affords the 4-boronic ester substituted Delta(2)-isoxazoline as the major regioisomer. If the reaction mixture is treated with t-BuOOH the corresponding 4-hydroxy-Delta(2)-isoxazolines are obtained in good yield.