Organic letters

Safe and reliable synthesis of diazoketones and quinoxalines in a continuous flow reactor

LJ Martin, AL Marzinzik, SV Ley, IR Baxendale

Index: Martin, Laetitia J.; Marzinzik, Andreas L.; Ley, Steven V.; Baxendale, Ian R. Organic Letters, 2011 , vol. 13, # 2 p. 320 - 323

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Citation Number: 78

Abstract

A flow method for the synthesis of aliphatic and aromatic diazoketones from acyl chloride precursors has been developed and used to prepare quinoxalines in a multistep sequence without isolation of the potentially explosive diazoketone. The protocol showcases an efficient in-line purification using supported scavengers with time-saving and safety benefits and in particular a reduction in the operator's exposure to carcinogenic ...