Chiral Propargylic Cations as Intermediates in S<sub>N</sub>1-Type Reactions: Substitution Pattern, Nuclear Magnetic Resonance Studies, and Origin of the Diastereoselectivity
作者:Dominik Nitsch、Stefan M. Huber、Alexander Pöthig、Arjun Narayanan、George A. Olah、G. K. Surya Prakash、Thorsten Bach
DOI:10.1021/ja411772n
日期:2014.2.19
substituents at the cationic center, with the nucleophile approaching the electrophilic center opposite to R(2). Transition states calculated for the reaction of allyltrimethylsilane with two representative cations support this hypothesis. Tertiary propargylic cations with a stereogenic center (-C*HXR(2)) in the α position were generated by ionization of the respective alcohol precursors with FSO3H in