Sodium hydride → HCID 67077116, compound

Participants

Reaction Steps

6.00 g (14 mmol) racemic (2R,3R and 2S,3S)-5-Benzyloxy-2-dibenzylamino-3-hydroxy-pentanoic acid in 20 ml dimethylformamide were added at 0° C. to a suspension of 1.37 g (31 mmol) sodium hydride (55%) in 25 ml dimethylformamide. The suspension was stirred for 3 hours and then 5.01 g (31 mmol) 2,5-difluoro-nitrobenzene in 10 ml dimethylformamide were added. After stirring overnight the mixture was poured under ice water and the pH was adjusted to 1. Extraction with ethylacetate and chromatography on silicagel with heptane/ethylacetate (4:1 to 1:1) yielded 6.00 g (75%) racemic (2R,3R and 2S,3S)-5-benzyloxy-2-dibenzylamino-3-(4-fluoro-2-nitro-phenoxy)-pentanoic acid as yellow oil, MS m/e (%): 559.3 (M+H+, 100).

Provenance & Evidence