[RuX(p-cymene)(bichep)]X, (X = I, Cl) and Ru(OAc)2(bichep) (bichep = 2,2′-bis(dicyclohexylphosphino)-6,6′-dimethyl-1,1′-biphenyl) proved to be highly efficient catalysts for asymmetric hydrogenation of carbonylcompounds bearing phenylglyoxyloyl group under mild conditions.
The First Catalytic, Asymmetric α-Additions of Isocyanides. Lewis-Base-Catalyzed, Enantioselective Passerini-Type Reactions
作者:Scott E. Denmark、Yu Fan
DOI:10.1021/ja035410c
日期:2003.7.1
The first, catalytic, enantioselective alpha-additions of isocyanides to aldehydes have been demonstrated (Passerini-typereactions). The catalytic system of silicon tetrachloride and a chiral bisphosphoramide 5a provided high yields and good to excellent enantioselectivities for the addition of tert-butyl isocyanide to a wide range of aldehydes (aromatic, olefinic, acetylenic, aliphatic). Aqueous
Quinoxalinyl macrocyclic hepatitis C serine protease inhibitors
申请人:Nakajima Suanne
公开号:US20070060510A1
公开(公告)日:2007-03-15
The present invention relates to compounds of Formula I or II, or a pharmaceutically acceptable salt, ester, or prodrug, thereof:
which inhibit serine protease activity, particularly the activity of hepatitis C virus (HCV) NS3-NS4A protease. Consequently, the compounds of the present invention interfere with the life cycle of the hepatitis C virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HCV infection. The invention also relates to methods of treating an HCV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.
Straightforward Enzymatic Process Based on HNL CLEA-Catalysis towards Cyanohydrin Derivatives
作者:Fabien L. Cabirol、Angela E. C. Lim、Ulf Hanefeld、Roger A. Sheldon
DOI:10.1021/op900207n
日期:2010.1.15
An efficient enzymatic process based on HNL-CLEA catalysis in buffer-saturated organic media was developed to limit the amount of overall waste generated and the number of safety issues incurred by handling HCN-containing waste. Starting front benzaldehyde as a model substrate, (R)- and (S)-mandelonitrile can be obtained under these reaction conditions without in extraction step being required. The crude cyanohydrin intermediate was sufficiently pure to be used as starting material in a second step towards a range of derivatives.