A new facile chemoenzymatic synthesis of levamisole
摘要:
An efficient and facile chemoenzymatic synthesis of levamisole by employing lipase-mediated resolution of 3-hydroxy-3-phenylpropanenitrile followed by its conversion to beta-amino alcohol as the key intermediate is described. (C) 2004 Elsevier Ltd. All rights reserved.
A study of the enantioselectivity exhibited by the lipase B from Candida antarctica in the transesterification of different alpha-substituted alpha-propylmethanols with vinyl acetate is shown. The best results are obtained when the large-sized (L) substituent of the alcohol is either a phenyl group or more especially a cyclohexyl group, although the reaction rates are lower than when linear or slightly branched groups are present. It is also found that ramification at the beta-position of the L substituent has a deleterious effect on both lipase activity and enantioselectivity. Moreover, some alpha-substituted benzyl alcohols bearing medium-sized (M) substituents larger than an ethyl and smaller than a propyl group are resolved by means of this methodology with moderate-good enantioselectivities (E=46-57) and similar reaction rates. (C) 2002 Elsevier Science Ltd. All rights reserved.
A new facile chemoenzymatic synthesis of levamisole
An efficient and facile chemoenzymatic synthesis of levamisole by employing lipase-mediated resolution of 3-hydroxy-3-phenylpropanenitrile followed by its conversion to beta-amino alcohol as the key intermediate is described. (C) 2004 Elsevier Ltd. All rights reserved.