Chemoenzymatic process for stereoselective preparation of R and S enatiomers of 2-hydroxy-3-(2-thienyl) propanenitrile
申请人:COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH
公开号:US20040185540A1
公开(公告)日:2004-09-23
A chemoenzymatic process for the stereoselective preparation of both the (R) and (S) enantiomers of 3-hydroxy-3-(2-thienyl) propanenitrile has been developed. These optically pure key intermediates were prepared by enzymatic resolution of (+)3-hydroxy-3-(2-thienyl) propanenitrile both by transesterification and by hydrolysis reaction which were then transformed to both enantiomers of duloxetine.
Enhanced activity and modified substrate-favoritism of Burkholderia cepacia lipase by the treatment with a pyridinium alkyl-PEG sulfate ionic liquid
作者:Shiho Kadotani、Toshiki Nokami、Toshiyuki Itoh
DOI:10.1016/j.tet.2018.12.028
日期:2019.1
Three types of pyridinium salts, i.e., 1-ethylpyridin-1-ium cetyl-PEG(10) sulfate (PYET), 1-butylpyridin-1-ium cetyl-PEG(10) sulfate (PYBU), and 1-(3-methoxypropyl)pyridin-1-ium cetyl-PEG(10) sulfate (PYMP), have been prepared and evaluated for their activation property of Burkholderia cepacia lipase by comparison to the control IL-coated enzymes, 1-butyl-2,3-dimethylimidazolium cetyl-PEG(10) sulfate-coated lipase PS (1L1-PS). Among the tested pyridinium salt-coated lipases, the PYET-coated lipase PS (PYET-PS) exhibited the best results; the transesterification of 1-(pyridin-2-yl)ethanol, 1-(pyridin-3-yl)ethanol, 1-(pyridin-4-yl)ethanol, or 4-phenylbut-3-en-2-ol proceeded faster than those of the IL1-PS-catalyzed reaction while maintaining an excellent enantioselectivity (E > 200). This improved efficiency was found to be dependent on the increased K-cat value. (C) 2018 Elsevier Ltd. All rights reserved.
Chemoenzymatic synthesis of duloxetine and its enantiomer: lipase-catalyzed resolution of 3-hydroxy-3-(2-thienyl) propanenitrile
An efficient and facile chemoenzymatic synthesis of duloxetine by lipase mediated resolution of 3-hydroxy-3-(2-thienyl)propanenitrile has been achieved. This process also describes an en antioconvergent synthesis of duloxetine via a Mitsunobu reaction. (C) 2003 Elsevier Science Ltd. All rights reserved.
CHEMOENZYMATIC PROCESS FOR STEREOSELECTIVE PREPARATION OF R- AND S-ENANTIOMERS OF 2-HYDROXY-3-(2-THIENYL) PROPANENITRILE