First Electrophilic Substitution of (−)-Agroclavine, Indoramine, Phenothiazine, Chlorpromazine, Iminodibenzyl, Imipramine, and Phenazone with Triethyl Orthoformate as an a1-Synthon
作者:Ulf Pindur、Helmut Witzel
DOI:10.1002/ardp.19903230712
日期:——
Agroclavine, imipramine hydrochloride, and phenazone reacted with triethylorthoformate under acid catalysis in an electrophilic, tandem substitution reaction to furnish C3‐symmetrical tris(heteroaryl)methanes while indoramine, phenothiazine, and iminodibenzyl were formylated, ethylated, or ethoxymethylated. The ambident electrophilic reactivity of triethylorthoformate as an a1‐synthon was clearly