Highly Enantioselective Direct Reductive Coupling of Conjugated Alkynes and α-Ketoesters via Rhodium-Catalyzed Asymmetric Hydrogenation

Jong-Rock Kong, Ming-Yu Ngai and Michael J. Krische*

*Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, Email: mkrischemail.utexas.edu

J.-R. Kong, M.-Y. Ngai, M. J. Krische, J. Am. Chem. Soc., 2006, 128, 718-719.

DOI: 10.1021/ja056474l (free Supporting Information)

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Abstract

Highly enantioselective direct catalytic reductive couplings of 1,3-enynes to activated ketones such as ethyl pyruvate have been achieved by using chirally modified cationic rhodium catalysts in the presence of hydrogen to afford dienylated α-hydroxy esters with exceptional levels of regio- and enantiocontrol.

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Iridium-Catalyzed C-C Bond Forming Hydrogenation: Direct Regioselective Reductive Coupling of Alkyl-Substituted Alkynes to Activated Ketones

M.-Y. Ngai, A. Barchuk, M. J. Krische, J. Am. Chem. Soc., 2007, 129, 280-281.

Catalytic Carbonyl Z-Dienylation via Multicomponent Reductive Coupling of Acetylene to Aldehydes and α-Ketoesters Mediated by Hydrogen: Carbonyl Insertion into Cationic Rhodacyclopentadienes

J. R. Kong, M. J. Krische, J. Am. Chem. Soc., 2006, 128, 16040-16041.

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Key Words

1,3-Dienes, Allylic Alcohols, Hydrogen, 1,3-Enynes

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ID: J48-Y2006-1320