Preparation of stable quinone methide imines
Abstract
Primary and secondary aromatic amines undergo electrophilic aromatic substitution with 2-methylthio-1,3-dithiolylium salts to give the corresponding 2-aryl-1,3-dithiolylium salts, which are deprotonated by 1,8-diaza-bicyclo [5,4,0] undec-5-ene to yield stable quinone methide imines.