Asymmetric synthesis of chiral glutaric acid derivatives via Rh-catalyzed enantioselective hydrogenation
摘要:
The first Rh-catalyzed enantioselective hydrogenation of dimethyl 2-methyleneglutarate and its derivatives has been reported. For the hydrogenation of dimethyl 2-methyleneglutarate with a chiral ferrocene-based monodentate phosphoramidite ligand (FAPhos), good enantioselectivity (over 90% ee) with full conversions was achieved. In contrast, the hydrogenation of substrates bearing an aryl substituent at a methylene moiety proved to be more difficult, in which the best enantioselectivity, of up to 81% ee was obtained by the use of a P-stereogenic BoPhoz-type ligand. (C) 2009 Elsevier Ltd. All rights reserved.
It is shown unequivocally by chemical correlations (cf. Schemes 1--3) and Raman optical activity spectra (cf. Fig. 1 and 2) that the (R)-configuration has to be attributed to (+)-1-methylindane ((+)-1). This is in contradiction to an earlier assignment of the (R)-configuration to (−)-1[2] which was based on the (R)-configuration of (+)-indane-1-carboxylic acid (3) [11].
作者:Paweł Dydio、Christophe Rubay、Tendai Gadzikwa、Martin Lutz、Joost N. H. Reek
DOI:10.1021/ja208589c
日期:2011.11.2
We report an achiral bisphosphine rhodiumcomplex equipped with a binding site for the recognition of chiral anion guests. Upon binding small chiral guests--cofactors--the rhodiumcomplex becomes chiral and can thus be used for asymmetric catalysis. Screening of a library of cofactors revealed that the best cofactors lead to hydrogenation catalysts that form the products with high enantioselectivity
The present invention concerns compounds inter alia according to general formula 1
a
. Compounds according to the invention are vasopressin V
1a
receptor antagonists. Pharmaceutical compositions of the compounds are useful as treatment of dysmenorrhoea.
The present invention relates to compounds of the formula (I) and pharmaceutically acceptable salts and solvates thereof, wherein the substituents are defined herein, to compositions containing such compounds and to the uses of such compounds for the treatment of allergic and respiratory conditions.
The present invention concerns compounds inter alia according to general formula 1a. Compounds according to the invention are vasopressin V
1a
receptor antagonists. Pharmaceutical compositions of the compounds are useful as treatment of dysmenorrhoea.