Sodium hydride → HCID 86605286, compound

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Reaction Steps

To 15.4 g (43.6 mmol) DL-4,4,4-trifluoro-N,N-bis(phenylmethyl)-threonine in 60 ml dimethylformamide were added in portions 4.03 g (92.4 mmol) sodium hydride (55%) at 0° C. The suspension was stirred for 2 hours and then 10.5 ml (95.9 mmol) 2,5-difluoro-nitrobenzene were added. After stirring overnight at 0° C. the mixture was poured on ice/water. Extraction with ethylacetate and chromatography on silicagel with ethylacetate/heptane 1:1 (and adding 30% methanol after the first five 250 ml fractions) yielded 11.7 g (55%) racemic (2S,3S and 2R,3R)-2-dibenzylamino-4,4,4-trifluoro-3-(4-fluoro-2-nitro-phenoxy)-butyric acid acid as yellow oil, MS m/e (%): 491.1 (M−H+, 100).

Provenance & Evidence