N-benzoyl-(2R,3S)-3-phenylisoserine methyl ester; a facile and convenient synthesis and resolution by entrainment
作者:Ranjan P. Srivastava、Jordan K. Zjawiony、John R. Peterson、James D. McChesney
DOI:10.1016/0957-4166(94)80079-0
日期:1994.9
The importance of N-benzoyl-(2R,3S)-phenylisoserine (3), also known as the “taxolsidechain”, for the strong antitumor activity of taxol (1), a potent anticancer drug, has prompted numerous efforts towards the development of a practicaltaxolsidechainsynthesis. Here we describe a highly practical and inexpensive synthesis of the taxolsidechain methyl ester 4 and resolution via entrainment based
Chiral catalysts and catalytic epoxidation catalyzed thereby
申请人:Research Corporation Technologies, Inc.
公开号:US05637739A1
公开(公告)日:1997-06-10
Methods of using chiral catalysts for enantioselectively epoxidizing a prochiral olefin and for enantioselectively oxidizing a prochiral sulfide are disclosed. In accordance with one aspect of the invention, the catalyst used is a salen derivative which has the following general structure: ##STR1## In accordance with another aspect of the present invention is a method of producing an epoxychroman using a chiral catalyst. In accordance with this method, a chromene derivative, an oxygen atom source, and a chiral catalyst are reacted under such conditions and for such time as is needed to epoxidize said chromene derivative. In accordance with yet another aspect of this invention is a method of enantioselectively epoxidizing a cis-cinnamate derivative to make taxol or an analog thereof. In accordance with another aspect a method of disproportionation of hydrogen peroxide using the catalysts of the present invention is disclosed.
Chiral catalysts for enantioselectively epoxidizing a prochiral olefin and for enantioselectively oxidizing a prochiral sulfide are disclosed, together with methods of using such catalysts. In accordance with one aspect of the invention, the catalyst is a salen derivative which has the following general structure: ##STR1## In accordance with another aspect of the present invention is a method of, producing an epoxychroman using a chiral catalyst. In accordance with this method, a chromene derivative, an oxygen atom source, and a chiral catalyst are reacted under such conditions and for such time as is needed to epoxidize said chromene derivative. In accordance with yet another aspect of this invention is a method of enantioselectively epoxidizing a cis-cinnamate derivative to make taxol or an analog thereof. In accordance with another aspect a method of disproportionation of hydrogen peroxide using the catalysts of the present invention is disclosed.
PROCESS FOR THE PREPARATION OF (2R,3S)-3-PHENYLISOSERINE METHYL ESTER ACETATE SALT
申请人:Ciceri Daniele
公开号:US20100168460A1
公开(公告)日:2010-07-01
A process for the enantioselective preparation of (2R,3S)-3-phenylisoserine methyl ester acetate salt of formula (I) which is an useful building block for the synthesis of taxane derivatives. The process involves the resolution of racemic threo-phenylisoserine amide and its conversion into (I).
[EN] PROCESS FOR THE PREPARATION OF (2R, 3R)-2-HYDROXY-3-AMINO-3-ARYL-PROPIONAMIDE AND (2R, 3R)-2-HYDROXY-3-AMINO-3-ARYL-PROPIONIC ACID ALKYL ESTER<br/>[FR] PROCEDE POUR PREPARER DU (2R, 3R)-2-HYDROXY-3-AMINO-3-ARYL-PROPIONAMIDE ET UN ESTER D'ALKYLE D'ACIDE (2R, 3R)-2-HYDROXY-3-AMINO-3-ARYL-PROPIONIQUE
申请人:DSM IP ASSETS BV
公开号:WO2006008170A1
公开(公告)日:2006-01-26
The invention relates to a novel compound (2R, 3R)-2 -hydroxy-3amino-3-aryl-propionamide according to formula (1), wherein aryl A represents a substituted or unsubstituted aromatic ring, and to a process for the preparation of said compound of formula (1), wherein a reaction mixture comprising the two enantiomers (2R,3S) and (2S,3R) of trans-3-aryl glycidic acid alkyl ester and the two enantiomers (2R,3R) and (2S,3S) of cis-3-aryl glycidic acid alkyl ester, said mixture being enantiomerically and diastereomerically enriched in the (2R,3S)-trans-3-arylglycidic acid alkyl ester, is reacted with ammonia. The invention further relates to a process for the preparation of (2R,3R)-2-hydroxy-3 amino-3-aryl-propionic alkyl ester.