Synthesis of highly substituted pyroglutamates via a domino Michael addition–Claisen rearrangement–lactamisation approach
作者:Christian Schmidt、Uli Kazmaier
DOI:10.1039/b811382c
日期:——
Chelated enolates are versatile nucleophiles for Michael additions to alpha,beta-unsaturated allylic esters. By quenching the reaction with TMSCl and heating a subsequent Ireland-Claisen rearrangement can occur. Direct cyclisation of the rearrangement product gives rise to highly substituted pyroglutamic acidderivatives.