An efficient, regiocontrolled synthesis of 5-aryl-2-carbethoxypyrroles from 3-aryl-3-chloropropeniminium salts
摘要:
A variety of 3-aryl-3-chloropropeniminium salts react with alpha-amino acid esters under basic conditions to produce 2-carbethoxy-5-arylpyrroles in a regioselective manner. The overall process represents a short, efficient, and convergent synthesis of 2,5-disubstituted pyrroles, and azomethine ylides or azapentadienyl anions may be involved as intermediates.
作者:Béatrice Quiclet-Sire、Frédérique Wendeborn (née Bertrand)、Samir Z. Zard
DOI:10.1039/b207061h
日期:——
The radical reaction between an N-ethylsulfonylenamide and an α-xanthyl ketone gives an intermediate γ-keto imine which spontaneously ring-closes to the pyrrole.