Enantioselective Intramolecular Hydroacylation of Unactivated Alkenes: An NHC-Catalyzed Robust and Versatile Formation of Cyclic Chiral Ketones
作者:Daniel Janssen-Müller、Michael Schedler、Mirco Fleige、Constantin G. Daniliuc、Frank Glorius
DOI:10.1002/anie.201412302
日期:2015.10.12
A highly enantioselectiveintramolecular N‐heterocyclic carbene (NHC)‐catalyzed hydroacylation reaction gives access to a range of cyclicketones from unactivated olefin‐substituted aldehydes (up to 99 % ee). Remarkably, aliphatic aldehydes were also transformed efficiently in an NHC‐catalyzed hydroacylation reaction for the first time.
Faster, higher, stronger! The N‐heterocyclic carbene (NHC) catalyzed diastereo‐ and enantioselectivehydroacylation of cyclopropenes affords structurally valuable acylcyclopropanes. A new family of electron‐rich, 2,6‐dimethoxyphenyl‐substituted NHCs induces excellent reactivity and enantioselectivity. Preliminary kinetic studies unambiguously demonstrated the superiority of this family of catalysts