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The lipase-catalyzed asymmetrization of the prochiral 2,2-disubstituted 1,3-propanediols 1, 6, and 9 was studied using various types of 1-ethoxyvinyl esters 2. Among them, the use of the benzoate 2f provided good chemical and optical yields of the products 3, 7, and 10 bearing chiral quaternary carbon centers which are fairly stable against racemization.
1-Ethoxyvinyl acetate 3 was found to be a high performance acyl donor for enzymatic resolution of alcohols featuring that (i) 3 shows high reactivity and high selectivity comparable to the most widely used vinyl acetate 1 and (ii) reaction of 3 generates low reactivity ethyl acetate 6 as a single side product, while that of 1 releases unfavorable acetaldehyde 4.
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