Kinetic resolution of 1-(benzofuran-2-yl)ethanols by lipase-catalyzed enantiomer selective reactions
摘要:
Kinetic resolution of racemic 1-(benzofuran-2-yl)ethanols rac-1a-d was performed by lipase-catalyzed enantiomer selective acylation (Emuch greater than100) yielding (1R)-1-acetoxy-1-(benzofuran-2-yl)ethanes (R)-2a-d and (1S)-1-(benzofuran-2-yl)ethanois (S)-1a-d in highly enantiopure form. The degree of enantiomer selectivity for enzymatic alcoholysis/hydrolysis processes starting from racemic 1-acetoxy-1-(benzofuran-2-yl)ethane rac-2 was also tested under various conditions including supercritical CO2 medium. Racemization-free lipase-catalyzed ethanolysis of the (1R)-1-acetoxy-1-(benzofuran-2-yl)ethanes (R)-2a-d yielded almost quantitatively the enantiopure (1R)-1-(benzofuran-2-yl)ethanols (R)-1a-d. (C) 2003 Elsevier Science Ltd. All rights reserved.
Kinetic resolution of 1-(benzofuran-2-yl)ethanols by lipase-catalyzed enantiomer selective reactions
摘要:
Kinetic resolution of racemic 1-(benzofuran-2-yl)ethanols rac-1a-d was performed by lipase-catalyzed enantiomer selective acylation (Emuch greater than100) yielding (1R)-1-acetoxy-1-(benzofuran-2-yl)ethanes (R)-2a-d and (1S)-1-(benzofuran-2-yl)ethanois (S)-1a-d in highly enantiopure form. The degree of enantiomer selectivity for enzymatic alcoholysis/hydrolysis processes starting from racemic 1-acetoxy-1-(benzofuran-2-yl)ethane rac-2 was also tested under various conditions including supercritical CO2 medium. Racemization-free lipase-catalyzed ethanolysis of the (1R)-1-acetoxy-1-(benzofuran-2-yl)ethanes (R)-2a-d yielded almost quantitatively the enantiopure (1R)-1-(benzofuran-2-yl)ethanols (R)-1a-d. (C) 2003 Elsevier Science Ltd. All rights reserved.