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by flash column chromatography on silica gel (hexanes/EtOAc 80:10) for
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General procedure for the preparation of (Æ)-trifluoroacetic acid 1-(4-
bromophenyl)-2-(2,2,2-trifluoroacetylamino) ethyl ester: Trifluoroacetic
anhydride (96 mL, 0.69 mmol) was added to a solution of 13h (50 mg,
0.23 mmol) in CH2Cl2 (3 mL) at RT. The reaction mixture was stirred at
RT for 1 h. After removal of the solvent, the desired N,O-bistrifluoroacyl
derivative was isolated by flash column chromatography on silica gel
(hexanes/EtOAc 80:10) for subsequent chiral GC analysis.
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Received: April 17, 2007
Published online: June 25, 2007
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