Operationally convenient asymmetric synthesis of (S)- and (R)-3-amino-4,4,4-trifluorobutanoic acid: Part II. Enantioselective biomimetic transamination of 4,4,4-trifluoro-3-oxo-N-[(R)-1-phenylethyl]butanamide |
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Authors: | Vadim A Soloshonok Hironari Ohkura Manabu Yasumoto |
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Institution: | Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, United States |
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Abstract: | An asymmetric synthesis of (S)- and (R)-3-amino-4,4,4-trifluorobutanoic acid via DBU-catalyzed asymmetric 1,3-proton shift transfer reaction of (Z)-3-(R)-1-phenylethylamino]-4,4,4-trifluoro-N-(R)-1-phenylethyl]but-2-enamide has been developed. The intermediate Schiff base (S,R′)-9 was found to be relatively configurationally stable under the highly basic reaction conditions allowing preparation of the target amino acid in high chemical yield and enantioselectivity. This method was demonstrated to be practical for large (>25 g) scale synthesis of the target β-amino acid. |
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Keywords: | 1 3-Proton shift reaction Fluorine and compounds Imines Enamines Operationally convenient conditions Asymmetric synthesis Biomimetic reductive methodology |
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