Pd-Catalyzed Alkene Difunctionalization Reactions of Enolates for the Synthesis of Substituted Bicyclic Cyclopentanes
作者:Evan C. Bornowski、Elsa M. Hinds、Derick R. White、Yusuke Nakamura、John P. Wolfe
DOI:10.1021/acs.oprd.9b00248
日期:2019.8.16
Palladium-catalyzed alkene difunctionalization reactions between alkenes bearing tethered aryl or alkenyl triflates and enolate nucleophiles are described. The transformations form two C–C bonds, a ring, and up to two stereocenters while producing substituted cyclopentane derivatives that contain appended carbonyl functionality. Products are formed with up to >20:1 diastereoselectivity, and the formation
Construction of Vicinal Tertiary and All-Carbon Quaternary Stereocenters via Ir-Catalyzed Regio-, Diastereo-, and Enantioselective Allylic Alkylation and Applications in Sequential Pd Catalysis
作者:Wen-Bo Liu、Corey M. Reeves、Scott C. Virgil、Brian M. Stoltz
DOI:10.1021/ja4052075
日期:2013.7.24
tertiary and all-carbon quaternary centers were generated via Ir-catalyzed asymmetric allylic alkylation of β-ketoesters. These catalytic reactions proceed in excellent yields with a broad scope on either reaction partner and with outstanding regio-, diastereo-, and enantiocontrol. Implementation of a subsequent Pd-catalyzed alkylation affords dialkylated products with pinpoint stereochemical control of
由叔和全碳季中心组成的高度拥挤的邻位立体中心是通过 Ir 催化的 β-酮酯的不对称烯丙基烷基化产生的。这些催化反应以优异的产率进行,在任一反应伙伴上都有广泛的范围,并具有出色的区域、非对映和对映控制。随后的 Pd 催化烷基化的实施提供了两个手性中心的精确立体化学控制的二烷基化产物。