Stereoselective alkylation–reduction of β-keto nitriles by the fungus Curvularia lunata
摘要:
The alkylation-reduction (AR) reaction of beta -keto nitriles by growing cells of Curvularia lunata CECT 2130 has been explored. The reaction conditions for the ethylation of benzoylacetonitrile have been optimized in terms of both yield and stereoselectivity and the mechanism of this biotransformation vas studied. The scope of this reaction has been extended to other alkylations (R = Et, Pr, Bu, iso-Bu) and to a series of aromatic and heteroaromatic substrates, yielding the corresponding optically active alpha -alkyl beta -hydroxy nitrites. The yield (directly related to competing carbonyl reduction reaction) depends on the substrate bulk. whereas the enantiomeric and diastereomeric excesses (both up to 98%) seem to be dependent on several Factors. (C) 2001 Elsevier Science Ltd. All rights reserved.
Stereoselective alkylation–reduction of β-keto nitriles by the fungus Curvularia lunata
摘要:
The alkylation-reduction (AR) reaction of beta -keto nitriles by growing cells of Curvularia lunata CECT 2130 has been explored. The reaction conditions for the ethylation of benzoylacetonitrile have been optimized in terms of both yield and stereoselectivity and the mechanism of this biotransformation vas studied. The scope of this reaction has been extended to other alkylations (R = Et, Pr, Bu, iso-Bu) and to a series of aromatic and heteroaromatic substrates, yielding the corresponding optically active alpha -alkyl beta -hydroxy nitrites. The yield (directly related to competing carbonyl reduction reaction) depends on the substrate bulk. whereas the enantiomeric and diastereomeric excesses (both up to 98%) seem to be dependent on several Factors. (C) 2001 Elsevier Science Ltd. All rights reserved.
Biotransformations of benzoylacetonitrile with the fungus Curvularia lunata: highly diastereo- and enantioselective synthesis of α-alkyl β-hydroxy nitriles and γ-amino alcohols
作者:Vicente Gotor、Juan R. Dehli、Francisca Rebolledo
DOI:10.1039/a909721j
日期:——
Incubation of alcoholic solutions of benzoylacetonitrile, 1, with a suitable aqueous culture of C. lunata results in highly diastereo- and enantioselective reactions leading to α-alkyl β-hydroxy nitriles 3, which are easily reduced to the corresponding γ-amino alcohols 6.
Stereoselective alkylation–reduction of β-keto nitriles by the fungus Curvularia lunata
作者:Juan R. Dehli、Vicente Gotor
DOI:10.1016/s0957-4166(01)00269-5
日期:2001.6
The alkylation-reduction (AR) reaction of beta -keto nitriles by growing cells of Curvularia lunata CECT 2130 has been explored. The reaction conditions for the ethylation of benzoylacetonitrile have been optimized in terms of both yield and stereoselectivity and the mechanism of this biotransformation vas studied. The scope of this reaction has been extended to other alkylations (R = Et, Pr, Bu, iso-Bu) and to a series of aromatic and heteroaromatic substrates, yielding the corresponding optically active alpha -alkyl beta -hydroxy nitrites. The yield (directly related to competing carbonyl reduction reaction) depends on the substrate bulk. whereas the enantiomeric and diastereomeric excesses (both up to 98%) seem to be dependent on several Factors. (C) 2001 Elsevier Science Ltd. All rights reserved.