A Concise Route to Pyridines from Hydrazides by Metal Carbene N−H Insertion, 1,2,4-Triazine Formation, and Diels−Alder Reaction
作者:Baolu Shi、William Lewis、Ian B. Campbell、Christopher J. Moody
DOI:10.1021/ol901502u
日期:2009.8.20
three-step sequence for the conversion of hydrazides into pyridines is reported in which the key steps are N−H insertion by a copper carbene intermediate derived from α-diazo-β-ketoesters into the hydrazide, reaction with ammonium acetate to give 1,2,4-triazines, followed by Diels−Alder reaction with norbornadiene.