反应详情

2-(4′-Hydroxy-biphenyl-4-sulfonylamino)-3-methyl-butyric acid tert-butyl ester (300 mg, 0.74 mmol, 1 eqiv.) was dissolved in diethyl ether (7.5 mL), followed by the addition of 4-fluorophenylisocyanate (101 mg, 0.74 mmol, 1 equiv.) and Et3N (1 mL). The reaction mixture was stirred at room temperature for 50 min. Solid precipitated from the reaction mixture. Solid was collected by filtration and washed with ether to yield 2-[4′-(4-Fluoro-phenylcarbamoyloxy)-biphenyl-4-sulfonylamino]-3-methyl-butyric acid tert-butyl ester in 57% yield (228 mg).

1. customSolid precipitated from the reaction mixture
2. filtrationSolid was collected by filtration
3. washwashed with ether