Ring‐Contraction Strategy for the Practical, Scalable, Catalytic Asymmetric Synthesis of Versatile γ‐Quaternary Acylcyclopentenes
作者:Allen Y. Hong、Michael R. Krout、Thomas Jensen、Nathan B. Bennett、Andrew M. Harned、Brian M. Stoltz
DOI:10.1002/anie.201007814
日期:2011.3.14
Contraction action! A simple protocol for the catalyticasymmetricsynthesis of highly functionalized γ‐quaternaryacylcyclopentenes (see schematic) in up to 91 % overall yield and 92 % ee has been developed. The reaction sequence employs a palladium‐catalyzed enantioselective alkylation reaction and exploits the unusual stability of β‐hydroxy cycloheptanones to achieve a general and robust method