Catalytic Dynamic Kinetic Resolutions with N-Heterocyclic Carbenes: Asymmetric Synthesis of Highly Substituted β-Lactones
作者:Daniel T. Cohen、Chad C. Eichman、Eric M. Phillips、Emily R. Zarefsky、Karl A. Scheidt
DOI:10.1002/anie.201203382
日期:2012.7.16
New DKR type: An N‐heterocyclic carbene (NHC)‐catalyzed dynamic kinetic resolution of racemic α‐substituted β‐keto esters has been developed. This method relies on the epimerization of an NHC‐enol intermediate before subsequent aldol/acylation events. Highly substituted β‐lactones are produced in good yield with good to excellent selectivities (see scheme).