Ireland-Claisen Rearrangement of 6-Methylene-1,4-oxazepan-2-ones
作者:Gints Smits、Artis Kinens、Ronalds Zemribo
DOI:10.1002/ejoc.201500918
日期:2015.10
The Ireland–Claisenrearrangement of 6-methylene-1,4-oxazepan-2-one-derived boron enolates leads to stereochemically defined, synthetically useful 4-(E)-ethylidene prolines. Detailed computational and experimental studies explain the stereochemical outcome of this transformation and suggest an unusual double-chelated transition state that involves two boron atoms. The scope of the method is also explored