Preparation of highly enantiopure β-amino esters by Candida antarctica lipase A
摘要:
The enantioselectivities for the reactions of aliphatic beta -substituted beta -amino esters [RCH(NH2)CH2CO2Et with R = Me, Et, n-Pr, i-Pr, CHEt2, cyclohexyl and Ph] with butyl butanoate in neat butyl butanoate and with 2,2,2-trifluoroethyl butanoate in diisopropyl ether were studied in the presence of Candida antarctica lipase A. Enantioselectivities ranging from good (E=70-100) to excellent (E>100) were commonly observed, allowing gram-scale resolution of the substrates. (C) 2001 Elsevier Science Ltd. All rights reserved.
Rh(I)-Catalyzed Enantioselective Hydrogenation of (E)- and (Z)-β-(Acylamino)acrylates Using 1,4-Bisphosphine Ligands under Mild Conditions
摘要:
[GRAPHICS]Rh-Me-BDPMI (1a) complex can be an effective catalyst for the hydrogenations of (E)- and (2)-beta-(acylamino)acrylates, in which the Zisomers hydrogenated with the same or even higher ee values than the corresponding E-isomers. The conversion yield and enantioselectivity of E-and Z-isomers were largely dependent on the solvent, and thus, the E-isomers were hydrogenated more effectively in CH2Cl2, whereas the Z-isomers were hydrogenated more effectively in polar MeOH solvent.
Rh(I)-Catalyzed Enantioselective Hydrogenation of (<i>E</i>)- and (<i>Z</i>)-β-(Acylamino)acrylates Using 1,4-Bisphosphine Ligands under Mild Conditions
作者:Sang-gi Lee、Yong Jian Zhang
DOI:10.1021/ol0261884
日期:2002.7.1
[GRAPHICS]Rh-Me-BDPMI (1a) complex can be an effective catalyst for the hydrogenations of (E)- and (2)-beta-(acylamino)acrylates, in which the Zisomers hydrogenated with the same or even higher ee values than the corresponding E-isomers. The conversion yield and enantioselectivity of E-and Z-isomers were largely dependent on the solvent, and thus, the E-isomers were hydrogenated more effectively in CH2Cl2, whereas the Z-isomers were hydrogenated more effectively in polar MeOH solvent.
Preparation of highly enantiopure β-amino esters by Candida antarctica lipase A
作者:Szilvia Gedey、Arto Liljeblad、László Lázár、Ferenc Fülöp、Liisa T. Kanerva
DOI:10.1016/s0957-4166(01)00002-7
日期:2001.2
The enantioselectivities for the reactions of aliphatic beta -substituted beta -amino esters [RCH(NH2)CH2CO2Et with R = Me, Et, n-Pr, i-Pr, CHEt2, cyclohexyl and Ph] with butyl butanoate in neat butyl butanoate and with 2,2,2-trifluoroethyl butanoate in diisopropyl ether were studied in the presence of Candida antarctica lipase A. Enantioselectivities ranging from good (E=70-100) to excellent (E>100) were commonly observed, allowing gram-scale resolution of the substrates. (C) 2001 Elsevier Science Ltd. All rights reserved.