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铑催化的β-酮酸的化学选择性和区域选择性脱羧加成反应至丙二烯:高效构建三级和季碳原子中心。

Rhodium-catalyzed chemo- and regioselective decarboxylative addition of β-ketoacids to allenes: efficient construction of tertiary and quaternary carbon centers.

机构信息

Institut für Organische Chemie, Albert-Ludwigs-Universität Freiburg , Albertstrasse 21, 79104 Freiburg im Breisgau, Germany.

出版信息

J Am Chem Soc. 2014 Jan 22;136(3):862-5. doi: 10.1021/ja411397g. Epub 2014 Jan 9.

DOI:10.1021/ja411397g
PMID:24397382
Abstract

A rhodium-catalyzed chemo- and regioselective intermolecular decarboxylative addition of β-ketoacids to terminal allenes is reported. Using a Rh(I)/DPPF system, tertiary and quaternary carbon centers were formed with exclusively branched selectivity under mild conditions. Preliminary mechanism studies support that the carbon-carbon bond formation precedes the decarboxylation and the reaction occurs in an outer-sphere mechanism.

摘要

报道了铑催化的β-酮酸与末端炔的化学选择性和区域选择性的脱羧加成反应。在温和条件下,使用 Rh(I)/DPPF 体系,仅以支链选择性形成了叔碳和季碳中心。初步的机理研究表明,碳-碳键的形成先于脱羧,反应在外层机制中进行。

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