Preparation of a chiral synthon for an HBV inhibitor: enzymatic asymmetric hydrolysis of (1α,2β,3α)-2-(benzyloxymethyl)cyclopent-4-ene-1,3-diol diacetate and enzymatic asymmetric acetylation of (1α,2β,3α)-2-(benzyloxymethyl)cyclopent-4-ene-1,3-diol
作者:Ramesh N. Patel、Amit Banerjee、Yadagiri R. Pendri、Jing Liang、Chung-Pin Chen、Richard Mueller
DOI:10.1016/j.tetasy.2005.08.061
日期:2006.1
Enantio selective asymmetric hydrolysis of (1 alpha,2 beta,3 alpha)-2-(benzyloxymethyl)-cyclopent-4-ene-1,3-diol diacetate 1 to the corresponding (+)-monoacetate 2 was carried out using lipase PS-30 from Pseudomonas cepacia or pancreatin. A reaction yield of 85 M % with an enantiomeric excess (ee) of 98% was obtained. Using pancreatin, a reaction yield of 75 M % with an ee of 98.5% was obtained. Asymmetric acetylation of (1 alpha,2 beta,3 beta) -2-(benzyloxymethyl)-cyclopent-4-ene-1,3-diol 3 to the corresponding (-)-monoacetate 4 was carried out using lipase PS-30 with isopropenyl acetate as the acylating agent. A reaction yield of 80 M % with an ee of 98% was obtained for (-)-monoacetate 4. (c) 2006 Elsevier Ltd. All rights reserved.