The Mannich Reaction of Hydrazones Amenable to Solid Phase Synthesis: A Powerful Tool for Heterocycle Preparation
作者:Valérie Atlan、Laurent Elkaim、Laurence Grimaud、Nirmal K. Jana、Adinath Majee
DOI:10.1055/s-2002-19745
日期:——
The Mannich reaction of hydrazones with aldehydes and benzylpiperazine yields functionalised hydrazones, which are efficient azoalkene precursors. When the hydrazonopiperazines are thus heated with various isocyanides in the presence of dibromoethane, 5-aminopyrazoles are cleanly formed. The choice of benzylpiperazine in the Mannich reaction allows a simple extension of this reaction to solid phase chemistry.