Continuous-Flow Preparation and Use of β-Chloro Enals Using the Vilsmeier Reagent
作者:Laurent Pellegatti、Stephen L. Buchwald
DOI:10.1021/op300168z
日期:2012.8.17
The Vilsmeier reagent is used in the preparation of a wide variety of heterocycles, such as pyrazoles, via formation of β-chloroacrolein intermediates. However, use of this extremely reactive reagent on large scale requires special precautions to avoid potentially dangerous exotherms. This article describes the safe preparation at room temperature of the Vilsmeier reagent under flow conditions for
通过形成β-氯丙烯醛中间体,Vilsmeier试剂可用于制备各种杂环,例如吡唑。但是,大规模使用这种反应性极强的试剂需要采取特殊的预防措施,以避免潜在的危险放热现象。本文介绍了在室温条件下安全制备Vilsmeier试剂以形成β-氯丙烯醛和3-甲酰基色酮的方法,以及它们在多步连续流动法中用于合成β-丙烯腈和多取代基的过程中的安全使用。吡唑类。