A copper‐catalyzed CDC reaction of β‐ketoesters with quinoxalin‐2(1H)‐one derivatives has been developed, providing a series of α‐quinoxalinone‐substituted β‐ketoesters in moderate to excellent yields with good functional group tolerance. The preliminary mechanistic investigations indicate that this reaction possibly underwent an unusual ionic pathway.
Tautomerism of 3-alkoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline derivatives
作者:D. D. Chapman
DOI:10.1039/j39660000806
日期:——
The compound previously formulated as ethyl 1,2-dihydro-2-oxoquinoxalin-3-ylacetate has the isomeric structure 3-ethoxycarbonylmethylene-2-oxo-1,2,3,4-tetrahydroquinoxaline in the solid state. In solution the 1-methyl derivative has been shown by nuclear magnetic resonance studies to exist as a tautomeric mixture of unsaturated and saturated esters.