Enzymatic resolution of bicyclo[n.1.0]alkan-1-ols derivatives: Preparation of optically active α-substituted α-methylcycloalkanones
摘要:
Optically active alpha-methyl alpha-substituted cycloalkanones are prepared by a chemoenzymatic sequence which involves a Lipozyme(R)-catalyzed transesterification of 1-(chloroacetoxy)bicyclo[n.1.0]alkanes and ring opening of these cyclopropanol derivatives. (C) 1998 Elsevier Science Ltd. All rights reserved.
N-2-(N',N'-diethylamino)ethyl imine reacts with a primary and secondary alkyl chloride or a primary alkyl fluoride to give an alpha-alkylated ketone in good to excellent yield after hydrolysis. The reaction takes place with a high level of inversion of stereochemistry at the electrophilic carbon center and will be useful for production of opticallyactive compounds.