The N-tert-butylcarbamoyl serves as a useful, readily removable (LiOH/MeOH/THF) new directed metalation group for the synthesis of 2-substituted pyrroles and indoles.
Preparation of 2-substituted pyrroles and indoles by regioselective alkylation and deprotection of 1-(2-trimethylsilylethoxymethyl)pyrrole and 1-(2-trimethylsilylethoxymethyl) indole
作者:Martin P. Edwards、Annette M. Doherty、Steven V. Ley、Helen M. Organ
DOI:10.1016/s0040-4020(01)87342-7
日期:1986.1
After N-alkylation of pyrrole and indole with 2-trimethylsilylethoxymethyl chloride the products of the reaction could be regioselectively deprotonated with n-butyllithium at the 2-position. Reaction of the resulting anions with acid chlorides, lactones, silyl chlorides or aldehydes gave addition products, some of which were deprotected to the parent pyrrole or indole using anhydrous tetra--butylammonium