First dynamic kinetic resolution of selenium-containing chiral amines catalyzed by palladium (Pd/BaSO4) and Candida antartica lipase (CAL-B)
作者:Leandro H. Andrade、Alexandre V. Silva、Eliane C. Pedrozo
DOI:10.1016/j.tetlet.2009.05.022
日期:2009.7
chemoenzymatic dynamickineticresolution of selenium-containing chiral amines (organoselenium-1-phenylethanamines) has been developed, leading to the corresponding amides in excellent enantioselectivities and high isolated yields. This one-pot procedure employs two different types of catalysts: Pd on barium sulphate (Pd/BaSO4) as racemization catalyst and lipase (CAL-B) as the resolution catalyst.
已开发出一种有效的化学方法,用于动态化学拆分含硒的手性胺(有机硒-1-苯基乙胺),从而以优异的对映选择性和高分离产率得到相应的酰胺。这种一锅法使用两种不同类型的催化剂:硫酸钡上的钯(Pd / BaSO 4)作为外消旋催化剂,脂肪酶(CAL-B)作为拆分催化剂。
First chemoenzymatic synthesis of organoselenium amines and amides
作者:Leandro H. Andrade、Alexandre V. Silva
DOI:10.1016/j.tetasy.2008.04.026
日期:2008.5
A series of organoselenium amines have been synthesized and submitted to the enzymatic kinetic resolution by acetylation mediated by CAL-B (Novozym 435) to give the corresponding chiral amides in an enantiomerically pure form. After evaluating the appropriate lipase, solvent, temperature,and lipase/substrate ratio in the kinetic resolution, the chiral organoselenium amides were obtained with enantiomeric excess of up to 99%. (C) 2008 Elsevier Ltd. All rights reserved.
ω-Transaminases as efficient biocatalysts to obtain novel chiral selenium-amine ligands for Pd-catalysis
作者:Leandro H. Andrade、Alexandre V. Silva、Priscila Milani、Dominik Koszelewski、Wolfgang Kroutil
DOI:10.1039/b920946h
日期:——
ω-Transaminases have been evaluated as biocatalysts in the reductive amination of organoselenium acetophenones to the corresponding amines, and in the kinetic resolution of racemic organoselenium amines. Kinetic resolution proved to be more efficient than the asymmetric reductive amination. By using these methodologies we were able to obtain both amine enantiomers in high enantiomeric excess (up to