Il Farmaco

Chemo-enzymatic synthesis of levodropropizine

E Caselli, G Tosi, A Forni, M Bucciarelli, F Prati

Index: Caselli, Emilia; Tosi, Giovanni; Forni, Arrigo; Bucciarelli, Maria; Prati, Fabio Farmaco, 2003 , vol. 58, # 10 p. 1029 - 1032

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Citation Number: 7

Abstract

Levodropropizine, an antitussive drug, was prepared in high enantiomeric excess in three steps, starting from dichloroacetone (2). Monosubstitution of 2 with sodium benzoate and subsequent baker's yeast reduction stereoselectively afforded the corresponding chlorohydrin in 73% ee, which was converted to levodropropizine and enantiomerically enriched up to 95% ee by fractional crystallisation.