Cobalt-Catalyzed Enantioselective Directed C–H Alkylation of Indole with Styrenes
摘要:
A cobalt-chiral phosphoramidite catalyst promotes enantioselective imine-directed C2-alkylation of Boc-protected indoles with styrenes. The reaction affords 1,1-diarylethane products in moderate to good yields with good enantioselectivities under mild conditions. A deuterium-labeling experiment suggests that the enantioselectivity is controlled by both the styrene insertion and the C-C reductive elimination steps.
Enantioselective Intramolecular Hydroarylation of Alkenes via Directed C−H Bond Activation
作者:Hitoshi Harada、Reema K. Thalji、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/jo801098z
日期:2008.9.1
Highly enantioselective catalytic intramolecular ortho-alkylation of aromatic imines containing alkenyl groups tethered at the meta position relative to the imine directing group has been achieved using [RhCl(coe)2]2 and chiral phosphoramidite ligands. Cyclization of substrates containing 1,1- and 1,2-disubstituted as well as trisubstituted alkenes were achieved with enantioselectivities >90% ee for
Method of Producing Macrocyclic Ketone, and Intermediate Thereof
申请人:Matsuda Hiroyuki
公开号:US20070287870A1
公开(公告)日:2007-12-13
A process for producing muscone by methyl addition to the 1,4-conjugation of 2-cyclopentadecenone. By the process, muscone is produced in high yield not under reaction condition including an extremely low temperature and a low concentration but under practical condition. The process comprises subjecting 2-cyclopentadecenone to a 1,4-conjugation addition reaction with an organometallic methylation reagent in the presence of a copper or nickel catalyst and an enol anion scavenger to obtain a 3-methyl-1-cyclopentadecene derivative represented by General Formula (II) and then solvolyzing the enol moiety of the 3-methyl-1-cyclopentadecene derivative to obtain muscone.
Enantioselective conjugate addition of diethylzinc to cyclic enones catalyzed by chiral copper complexes containing a new phosphorus ligand with an H8-binaphthoxy moiety
作者:Fu-Yao Zhang、Albert S.C Chan
DOI:10.1016/s0957-4166(98)00092-5
日期:1998.4
A new chiral phosphorus amidite ligand with an H-8-binaphthoxy moiety was synthesized and applied to the copper-catalyzed asymmetric conjugate addition of diethylzinc to cyclic enones with high enantioselectivity. The results gave support to the generality of the advantage of the sterically more demanding H-8-binaphthyl backbone in biaryl chiral ligands. (C) 1998 Elsevier Science Ltd. All rights reserved.
PROCESS FOR PRODUCING LARGE CYCLIC KETONE AND INTERMEDIATE THEREFOR