Mukaiyama-Michael Reactions with<i>trans</i>-2,5-Diarylpyrrolidine Catalysts: Enantioselectivity Arises from Attractive Noncovalent Interactions, Not from Steric Hindrance
作者:Eeva K. Kemppainen、Gokarneswar Sahoo、Antti Piisola、Andrea Hamza、Bianka Kótai、Imre Pápai、Petri M. Pihko
DOI:10.1002/chem.201304240
日期:2014.5.12
the predicted and observed stereoselectivities. The analysis of intermolecular forces reveals that the enantioselectivity is mostly due to stabilizing noncovalentinteractions between the reacting partners, not due to sterichindrance. The role of attractivenoncovalentinteractions in enantioselective catalysis may be underappreciated.
PHOSPHORAMIDITE LIGAND AND PRODUCTION METHOD OF ALLYLIC AMINE USING THE SAME
申请人:CARREIRA Erick M.
公开号:US20090054689A1
公开(公告)日:2009-02-26
The present invention provides a production method of an allylic amine represented by the formula (III):
wherein R
3
is as defined in the specification,
which comprises reacting by an allylic alcohol represented by the formula (II):
wherein R
3
is as defined in the specification,
with sulfamic acid, in the presence of a phosphoramidite ligand represented by the formula (I):
wherein each symbol is as defined in the specification, and an iridium complex. According to the present invention, a primary allylic amine can be produced directly from an allylic alcohol, without use of an activator for an allylic alcohol and conversion of an allylic alcohol into an activated compound thereof.
[EN] SYNTHESIS OF R-BIPHENYLALANINOL<br/>[FR] SYNTHÈSE DE R-BIPHÉNYLALANINOL
申请人:DSM IP ASSETS BV
公开号:WO2013026773A1
公开(公告)日:2013-02-28
This invention relates to a novel process for the synthesis of R-biphenylalaninol and to intermediate compounds that are formed in the process according to the invention, i.e. novel intermediates useful in the synthesis of R-biphenylalaninol. The invention also relates to R-biphenylalaninol, The process according to the invention, the intermediates to of R-biphenylalaninol and of R-biphenylalaninol are all useful in the synthesis of pharmaceutically active compounds.
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.
Copper-catalyzed conjugate addition on macrocyclic, cyclic, and acyclic enones with a chiral phosphoramidite ligand having a C2-symmetric amine moiety
作者:Yong Hyun Choi、Jun Young Choi、Hye Yon Yang、Yong Hae Kim
DOI:10.1016/s0957-4166(02)00206-9
日期:2002.5
A binaphthol-based phosphoramidite ligand (4.2 mol%) having a C-2-symmetric chiral amine moiety was examined for enantioselective 1,4-additions of dialkylzinc reagents to various macrocyclic, cyclic, and acyclic enones catalyzed by copper triflate-toluene complex (2 mol%) to afford high enantiomeric excess (up to >95% ee). (C) 2002 Elsevier Science Ltd. All rights reserved.