A Combined DFT and NMR Investigation of the Zinc Organometallic Intermediate Proposed in the<i>Syn</i>-Selective Tandem Chain Extension–Aldol Reaction of β-Keto Esters
作者:Karelle S. Aiken、Wilhelm A. Eger、Craig M. Williams、Carley M. Spencer、Charles K. Zercher
DOI:10.1021/jo3004925
日期:2012.7.20
esters provides an α-substituted γ-keto ester with an average syn:anti selectivity of 10:1. It is proposed that the reaction proceeds via a carbon–zinc bound organometallic intermediate potentially bearing mechanistic similarity to the Reformatsky reaction. Evidence, derived from control Reformatsky reactions and a study of the structure of the TCA intermediate utilizing DFT methods and NMR spectroscopy