Enantioselective acylation of alcohols catalyzed by lipase QL from Alcaligenes sp.: A predictive active site model for lipase QL to identify the faster reacting enantiomer of an alcohol in this acylation
摘要:
Lipase QL-catalyzed acylation of secondary alcohols using isopropenyl acetate as the acylating agent in diisopropyl ether gave preferentially the corresponding acetate with an R configuration. On the basis of the results, a predictive active site model for lipase QL is proposed for identifying which enantiomer of a secondary alcohol reacts faster in this reaction. (C) 1996 Elsevier Science Ltd
Palladium-catalyzed substitution of esters of naphthylmethanols, 1-naphthylethanols, and analogues by sodium dimethyl malonate. Stereoselective synthesis from enantiomerically pure substrates
The palladium-catalyzed substitution of carbonates of the titled alcohols was performed at lower temperature than the previously reported reaction of the corresponding acetates. The use of enantiomericallypure carbonates gave substitution products with overall retention of the configuration (up to 97%).
Enantioselective syntheses of both enantiomers of l-arylethanols with a condensed aromatic ring have been done through acetylation of the racemic alcohols with vinyl acetate in the presence of a lipase from Pseudomonas aeruginosa (Toyobo, LIP). The lipase LIP showed high enantioselectivity and reactivity for the title compounds, reacted acetates, and remaining alcohols were obtained with high optical purity.
Enantioselective acylation of primary and secondary alcohols catalyzed by lipase QL from Alcaligenes sp.: A predictive active site model for lipase QL to identify which enantiomer of an alcohol reacts faster in this acylation
Lipase QL (from Alcaligenes sp.)-catalyzed acylation of alcohols using isopropenyl acetate as the acylating agent in diisopropyl ether converted preferentially primary alcohols with an S configuration and secondary alcohols with an R configuration into the corresponding homochiral acetates. On the basis of observed enantiomer selectivities, a predictive active site model for lipase QL is proposed for identifying which enantiomer of a primary or a secondary alcohol reacts faster in this acylation. Copyright (C) 1996 Published by Elsevier Science Ltd
Studies in the Phenanthrene Series. V. 9-Acetylphenanthrene. Reduction Products of 2-, 3- and 9-Acetylphenanthrenes<sup>1</sup>