Pyrrole aus 3-Alkoxyacroleinen und CH-aciden α-Aminoessigsäure-Derivaten
作者:Gul Hassan Walizei、Eberhard Breitmaier
DOI:10.1055/s-1989-27249
日期:——
Pyrroles from 3-Alkoxyacroleins and CH-acidic α-Aminoacetic Acid Derivatives 2-Alkoxycarbonylpyrroles and 2-cyanopyrroles 4 are prepared in a one-step synthesis by vinylogous amidation of 3-alkoxyacroleins 1 with glycine ester 2a-c and aminoacetonitrile (2d), followed by basecatalyzed cyclodehydration of the intermediate 3-aminoacroleins 3. The 3-hydroxypropyl function can be introduced into the pyrrole ring by using 3,4-dihyrdo-2H-pyran-5-carbaldehyde (5) as a cyclic 3-alkoxyacrolein.