Sodium hydride → HCID 67406367, compound

Participants

Reaction Conditions

Reaction Steps

In THF (100 ml) were dissolved 1-benzyloxy-2,3-difluoro-6-nitrobenzene (4.17 g, 15.7 mmol) and di-tert-butyl malonate (3.52 ml, 15.7 mmol). To the resulting solution was added sodium hydride (60% in oil, 1.26 g, 31.4 mmol) in portions under stirring at 0° C. The reaction mixture was stirred at 0° C. for 30 minutes and then at 80° C. for 9 hours. Di-tert-butyl malonate (7.04 ml, 31.4 mmol) and sodium hydride (60%; 2.52 g, 52.8 mmol) were added and the mixture was stirred at 80° C. for 2 days. After cooling to room temperature, the reaction mixture was poured in ice water (100 ml), followed by extraction with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous sodium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column (silica gel: 200 g), whereby from hexane/ethyl acetate (8/1) eluate fractions, the title compound (6.87 g, 95%) was obtained as an orange solid.

Provenance & Evidence