Triphenylphosphine → HCID 18665572, compound

Participants

Reaction Steps

To a mixture of 3-[3-(4,5-dihydro-4(R)-phenyloxazol-2-yl)-2-fluorophenyl]-2-propyn-1-ol (1.41 g, 4.8 mmol), N,O-bis(tert-butoxycarbonyl)hydroxylamine (1.11 g, 4.8 mmol) and triphenylphosphine (1.63 g, 6.2 mmol) in dry tetrahydrofuran (350 ml) was added dropwise a solution of diethyl azodicarboxylate (1.08 g, 6.2 mmol) in dry tetrahydrofuran (15 ml). The reaction mixture was stirred for 2 hours and volatiles removed by evaporation. The residue was purified by column chromatography on silica gel eluting with ethyl acetate-hexane (=1:10) to afford N,O-di(tert-butoxycarbonyl)-[3-[3-(4,5-dihydro-4(R)-phenyloxazol-2-yl)-2-fluoro-phenyl]-2-propyn-1-yl]hydroxylamine (1.64 g, 67%) as pale yellow plates.

Provenance & Evidence