1,7-Asymmetric Induction in a Nitrogen Ring Expansion Process Facilitated by in Situ Tethering
作者:Kelly Furness、Jeffrey Aubé
DOI:10.1021/ol990685b
日期:1999.8.1
[GRAPHICS]There are only a few methods for the asymmetric ring expansion of prochiral ketones. Symmetrically substituted cyclohexanones can be converted to the corresponding ring expanded caprolactam with excellent 1,7 diastereoselectivity (greater than or equal to 93% ds) and yields (greater than or equal to 86%), using a chiral hydroxy azide-mediated Schmidt reaction.