Pd(II)-Catalyzed Enantioselective C–H Activation of Cyclopropanes
作者:Masayuki Wasa、Keary M. Engle、David W. Lin、Eun Jeong Yoo、Jin-Quan Yu
DOI:10.1021/ja207607s
日期:2011.12.14
Systematic ligand development has led to the identification of novel mono-N-protected amino acid ligands for Pd(II)-catalyzed enantioselective C-H activation of cyclopropanes. A diverse range of organoboron reagents can be used as coupling partners, and the reaction proceeds under mild conditions. These results provide a new retro-synthetic disconnection for the construction of enantioenriched cis-substituted cyclopropanecarboxylic acids.
Synthesis and anorectic activity of some 1-benzylcyclopropylamines
作者:Carl Kaiser、Charles A. Leonard、George C. Heil、Bruce M. Lester、David H. Tedeschi、Charles L. Zirkle
DOI:10.1021/jm00299a007
日期:1970.9
BARTHA E.; ARVAY Z.; RAZUS A. C., REV. ROUM. CHIM., 31,(1986) N 5, 519-524
作者:BARTHA E.、 ARVAY Z.、 RAZUS A. C.
DOI:——
日期:——
Palladium(II)-Catalyzed Highly Enantioselective C–H Arylation of Cyclopropylmethylamines
作者:Kelvin S. L. Chan、Hai-Yan Fu、Jin-Quan Yu
DOI:10.1021/ja512529e
日期:2015.2.11
C-H arylation via a Pd(II)/Pd(IV) catalytic cycle has been one of the most extensively studied C-H activation reactions since the 1990s. Despite the rapid development of this reaction in the past two decades, an enantioselective version has not been reported to date. Herein, we report a Pd(II)-catalyzed highly enantioselective (up to 99.5% ee) arylation of cyclopropyl C-H bonds with aryl iodides using mono-N-protected amino acid (MPAA) ligands, providing a new route for the preparation of chiral cis-aryl-cyclopropylmethylamines. The enantiocontrol is also shown to override the diastereoselectivity of chiral substrates.
Palladium(0)-Catalyzed Enantioselective CH Arylation of Cyclopropanes: Efficient Access to Functionalized Tetrahydroquinolines
作者:Tanguy Saget、Nicolai Cramer
DOI:10.1002/anie.201207959
日期:2012.12.14
Activated: The title reaction proceeds efficiently with 1 mol % of palladium and gives tetrahydroquinolines in excellent enantioselectivities (see scheme). The enantiodiscriminating concerted metalation–deprotonation step occurs via a rare seven‐membered palladacycle. The cyclopropyl‐substituted tetrahydroquinolines can be regioselectively and enantiospecifically reduced to chiral tetrahydrobenzoazepines