Enantiomers of adrenaline-type amino alcohols by Burkholderia cepacia lipase-catalyzed asymmetric acylation
摘要:
Burkholderia cepacia lipase-catalyzed acylation with butanoic anhydride was used for the preparation of pharmaceutically important norphenylephrine and octopamine enantiomers, all in 98% ee. Reactivity of the phenolic OH groups and easy racemization, especially in the case of octopamine, complicated optimization. For norphenylephrine, chemical N-acylation was fast and allowed the subsequent enzymatic benzylic acylation in situ. The preparation of the octopamine enantiomers became possible by using the N-Fmoc protected substrate and by the Candida antarctica lipase B-catalyzed deprotection of the OH groups before the N-deprotection was performed. (C) 2004 Elsevier Ltd. All rights reserved.
Enantiomers of adrenaline-type amino alcohols by Burkholderia cepacia lipase-catalyzed asymmetric acylation
摘要:
Burkholderia cepacia lipase-catalyzed acylation with butanoic anhydride was used for the preparation of pharmaceutically important norphenylephrine and octopamine enantiomers, all in 98% ee. Reactivity of the phenolic OH groups and easy racemization, especially in the case of octopamine, complicated optimization. For norphenylephrine, chemical N-acylation was fast and allowed the subsequent enzymatic benzylic acylation in situ. The preparation of the octopamine enantiomers became possible by using the N-Fmoc protected substrate and by the Candida antarctica lipase B-catalyzed deprotection of the OH groups before the N-deprotection was performed. (C) 2004 Elsevier Ltd. All rights reserved.
Room Temperature Ionic Liquids in the Kinetic Resolution of Adrenaline-Type Aminoethanols byBurkholderia cepacia Lipase under Normal and Microwave Conditions
作者:Katri Lundell、Toni Kurki、Maria Lindroos、Liisa T. Kanerva
DOI:10.1002/adsc.200505049
日期:2005.6
The lipase PS-C II (lipase from Burkholderia cepacia immobilized on ceramic particles)-catalyzed acylations of N-acylated 2-amino-1-phenylethanol (rac-1) and N-acylated norphenylephrine (rac-2) have been studied in imidazolium- and pyridinium-based ionicliquids, in tert-butyl methyl ether (TBME) and in their mixtures. Enzymatic chemo- and enantioselectivities in the presence of hydrophobic EMIM⋅NTf2
Enantiomers of adrenaline-type amino alcohols by Burkholderia cepacia lipase-catalyzed asymmetric acylation
作者:Katri Lundell、Erja Katainen、Anu Kiviniemi、Liisa T. Kanerva
DOI:10.1016/j.tetasy.2004.10.027
日期:2004.11
Burkholderia cepacia lipase-catalyzed acylation with butanoic anhydride was used for the preparation of pharmaceutically important norphenylephrine and octopamine enantiomers, all in 98% ee. Reactivity of the phenolic OH groups and easy racemization, especially in the case of octopamine, complicated optimization. For norphenylephrine, chemical N-acylation was fast and allowed the subsequent enzymatic benzylic acylation in situ. The preparation of the octopamine enantiomers became possible by using the N-Fmoc protected substrate and by the Candida antarctica lipase B-catalyzed deprotection of the OH groups before the N-deprotection was performed. (C) 2004 Elsevier Ltd. All rights reserved.