文摘
In this paper we describe the chemoenzymatic synthesis of new enantiomerically enriched (R)- and (S)-1-(2-arylthiazol-4-yl)ethanols and their acetates by enzymatic enantioselective acetylation of the racemic alcohols rac-2a-d and by methanolysis of the corresponding racemic esters rac-3a-d mediated by lipase B from Candida antarctica (CaL-B) in non-aqueous media. In terms of stereoselectivity and activity, both procedures, acylation and alcoholysis, gave similar good results (50 % conversion, E ? 200). The absolute configuration of the kinetic resolution products was determined by a detailed 1H NMR study of the Mosher's derivatives of (S)-2b.