2,2-ジアミノエノールを視る！ <i>N</i>-ヘテロ環状カルベンによるアルデヒドの極性転換

Abstract

The 56-years old “Breslow intermediate” has played a most important role in the umpolung reaction of aldehydes triggered by carbenes such as N-heterocyclic carbenes. Chemists have paid enormous efforts to capture the Breslow intermediate (or its analogues); however, it still remains a challenge. In this review, recent progresses in this field are briefly summarized.