N6 - tert -Butoxycarbonyl derivatives of sydnone imines: Preparation and synthetic use
作者:Ilya A. Cherepanov、Alina S. Samarskaya、Ivan A. Godovikov、Konstantin A. Lyssenko、Anastasia A. Pankratova、Valery N. Kalinin
DOI:10.1016/j.tetlet.2018.01.019
日期:2018.2
A highly efficient gram-scale method for the C(4)-functionalization of sydnone imine hydrochloride derivatives was developed. This new approach was realized through consecutive reactions including the preparation of a C(3)-substituted N6-tert-butoxycarbonyl sydnone imine derivative, deprotonation with n-BuLi and reaction of the lithiated-intermediate with an electrophilic agent, and removal of the