Chemoenzymatic synthesis of chiral epoxides. Preparation of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane
摘要:
All the stereoisomers of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane (beta-methylstyrene oxide) have been prepared in three steps from 4-phenyl-2-butanone and 1-phenyl-2-propanone or 1-phenyl-1-propanone respectively. The key step is the microbiological reduction of the corresponding haloketones. These results confirm those previously described(1) and demonstrate that the chemoenzymatic synthesis of homochiral 2,3-epoxides is a general method that can be used whatever the starting ketone.
Chemoenzymatic synthesis of chiral epoxides. Preparation of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane
摘要:
All the stereoisomers of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane (beta-methylstyrene oxide) have been prepared in three steps from 4-phenyl-2-butanone and 1-phenyl-2-propanone or 1-phenyl-1-propanone respectively. The key step is the microbiological reduction of the corresponding haloketones. These results confirm those previously described(1) and demonstrate that the chemoenzymatic synthesis of homochiral 2,3-epoxides is a general method that can be used whatever the starting ketone.
Molecular design of thermostable alcohol dehydrogenase for synthesis for chiral aromatic alcohols
申请人:Zeikus J. Gregory
公开号:US20080220487A1
公开(公告)日:2008-09-11
The present invention relates to compositions and methods utilizing thermostable and novel alcohol dehydrogenase enzymes for biosynthesizing chiral specific molecules for use as precursor molecules in synthesizing pharmaceutical compounds. Particularly, in preferred embodiments, the invention relates to directed engineering of an enzymatic catalytic site of an alcohol dehydrogenase enzyme gene for enhancing enantioselectivity for (S)-enantiomer substrate catalytic activity for providing aryl (S)-enantiomer products in stereomeric excess.
Direct asymmetric bromination of aldehydes catalyzed by a binaphthyl-based secondary amine: highly enantio- and diastereoselective one-pot synthesis of bromohydrins
作者:Taichi Kano、Fumitaka Shirozu、Keiji Maruoka
DOI:10.1039/c0cc02739a
日期:——
One-pot stereoselective synthesis of bromohydrins as a useful chiral building block was achieved by the reaction of Grignard reagents with optically active alpha-bromoaldehydes, which were in situ generated by directasymmetric bromination of aldehydescatalyzed by a binaphthyl-based secondary amine (S)-3.
Chemoenzymatic synthesis of chiral epoxides. Preparation of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane
作者:Pascale Besse、Michel F. Renard、Henri Veschambre
DOI:10.1016/0957-4166(94)80167-3
日期:1994.7
All the stereoisomers of 4-phenyl-2,3-epoxybutane and 1-phenyl-1,2-epoxypropane (beta-methylstyrene oxide) have been prepared in three steps from 4-phenyl-2-butanone and 1-phenyl-2-propanone or 1-phenyl-1-propanone respectively. The key step is the microbiological reduction of the corresponding haloketones. These results confirm those previously described(1) and demonstrate that the chemoenzymatic synthesis of homochiral 2,3-epoxides is a general method that can be used whatever the starting ketone.