Abstract
Abstract An efficient and convenient approach to synthesis of new, enantiopure hydroxyalkyl derivatives of 4,5,6,7-tetrabromo-1 H -benzotriazole (TBBt) has been developed. Prochiral ketones synthesized through alkylation of TBBt were reduced to racemic secondary alcohols, which were separated by kinetic resolution carried out by lipase-catalyzed transesterification. After optimization of solvent, lipase and acyl donor group, the highest enantioselectivity factor ( E > 200) and optical purity of the products (>99%) was achieved with lipase Amano AK from Pseudomonas fluorescens in tert -butyl methyl ether.
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