A Convenient Synthesis of α-Substituted β,γ-Unsaturated Ketones and Esters via the Direct Addition of Substituted Allylic Zinc Reagents Prepared by Direct Insertion
作者:Paul Knochel、Christoph Sämann
DOI:10.1055/s-0033-1338415
日期:——
regioselectivity. A practical and convenient procedure for the synthesis of α-substituted β,γ-unsaturated ketones and esters has been developed. Substituted allylic zinc reagents, prepared via direct metal insertion in substituted allylic halides, react readily with a broad range of acid chlorides and chloroformates furnishing the corresponding α-substituted β,γ-unsaturated ketones and esters in high yield and perfect
Diastereoselective Synthesis of Homoallylic Alcohols with Adjacent Tertiary and Quaternary Centers by Using Functionalized Allylic Aluminum Reagents
作者:Zhihua Peng、Tobias D. Blümke、Peter Mayer、Paul Knochel
DOI:10.1002/anie.201003813
日期:2010.11.2
Sensitive functional groups, including ester and cyano groups, can be present in allylicaluminumreagents prepared by aluminum insertion in the presence of InCl3. These aluminum organometallic compounds undergo addition reactions to various functionalized aldehydes or ketones with remarkable diastereoselectivities allowing the construction of two adjacentquaternary and tertiarycenters (see scheme)