Lipase-mediated diastereoselective and enantioselective acetylations of 3-substituted cyclohexanols
摘要:
Lipase-mediated acetylation of four diastereomeric and enatiomeric isomers of 3-substituted cyclohexanols 2 has led to an efficient resolution to provide a single stereoisomer, (1R,3S)-cyclohexyl acetate (1R,3S)-3 in a high enantiomeric excess. (C) 1998 Elsevier Science Ltd. All rights reserved.
Baker's yeast-mediated reduction of cyclohexanones containing a nitro or a sulfonyl group at C-3
摘要:
Baker's yeast-mediated reduction of 3-(nitromethyl)-, 3-(phenylsulfonyl)-, and 3-[(phenylsulfonyl)methyl]-cyclohexanone la,c,a led to the delivery of a hydride to the re-face of the prochiral ketones to provide cyclohexanols (1S,3S)- and (1S,3R)-2a,c,d with high enantioselectivities in good yields. The remote nitro and sulfonyl groups, in contrast to alkyl and sulfenyl groups, may play an important role in binding to an enzyme. (C) 1997 Elsevier Science Ltd.