Kinetic resolution of acyclic 1,2-diols using a sequential lipase-catalyzed transesterification in organic solvents
摘要:
A method for the kinetic resolution of 3-(aryloxy)-1,2-propanediols rac-1a-n without additional protection-deprotection steps using a lipase-catalyzed sequential transesterification with lipase amnno PS has been developed. In the first step of this one-pot procedure the racemic 1,2-diols are acylated regioselectively at the primary hydroxy group without enantioselection. The subsequent acylation at the secondary hydroxy group of the formed primary monoacetate is responsible for high enantioselection. The enantioselectivity of this transformation depends significantly on the substitution pattern of the aryl ring and the organic solvent used. 3-(Aryloxy)-1,2-propanediols with substituents in the para-position show a much higher enantioselectivity than the corresponding derivatives with ortho-substituents. Among other substrates, the pharmaceuticals Mephenesin, Guaifenesin, and Chlorphenesin have been resolved. The replacement of the aryloxy by alkyl substituent causes a dramatic decrease of enantioselectivity.
Auzou; Rips; Derappe, European Journal of Medicinal Chemistry, 1974, vol. 9, # 5, p. 548 - 554
作者:Auzou、Rips、Derappe、Peyroux
DOI:——
日期:——
PERSONAL CARE COMPOSITION IN A DISSOLVABLE CONTAINER
申请人:The Dial Corporation
公开号:US20170156999A1
公开(公告)日:2017-06-08
The present disclosure describes a cleansing device. The cleansing device includes a container that is dissolvable in water. The cleansing device also includes a personal care composition. The personal care composition is disposed within the container. When the container dissolves, the personal care composition is to be deposited on a surface.
Kinetic resolution of acyclic 1,2-diols using a sequential lipase-catalyzed transesterification in organic solvents
A method for the kinetic resolution of 3-(aryloxy)-1,2-propanediols rac-1a-n without additional protection-deprotection steps using a lipase-catalyzed sequential transesterification with lipase amnno PS has been developed. In the first step of this one-pot procedure the racemic 1,2-diols are acylated regioselectively at the primary hydroxy group without enantioselection. The subsequent acylation at the secondary hydroxy group of the formed primary monoacetate is responsible for high enantioselection. The enantioselectivity of this transformation depends significantly on the substitution pattern of the aryl ring and the organic solvent used. 3-(Aryloxy)-1,2-propanediols with substituents in the para-position show a much higher enantioselectivity than the corresponding derivatives with ortho-substituents. Among other substrates, the pharmaceuticals Mephenesin, Guaifenesin, and Chlorphenesin have been resolved. The replacement of the aryloxy by alkyl substituent causes a dramatic decrease of enantioselectivity.
Three different types of chirality-driven crystallization within the series of uniformly substituted phenyl glycerol ethers
作者:Alexander A. Bredikhin、Zemfira A. Bredikhina、Victorina G. Novikova、Alexander V. Pashagin、Dmitry V. Zakharychev、Aidar T. Gubaidullin
DOI:10.1002/chir.20648
日期:2008.10
derived and binaryphasediagrams were reconstructed for the whole family. Solid racemic compounds stabilities were ranked for the four substances. Spontaneous resolution was established for the registered chiral drug mephenesin and its ethyl analogue. Metastable anomalous conglomerate, forming crystals having three independent R* and one independent S* molecules in the unit cell, is formed during solution