反应详情

A solution of 1.00 g (3.8 mmole) of 3(S)-t-butoxycarbonylamino-2-hydroxy-5-methylhexanoic acid prepared by the method of R. L. Johnson [J. Med. Chem., 25, 605 (1982)] in 30 ml, of methanol was stirred, whilst cooling with ice, and then a diethyl ether solution of diazomethane was added and the mixture was stirred at room temperature for 1 hour. The solvent was then distilled off and the resulting solid was recrystallized from hexane to give 952 mg of the title product as colorless needles, melting at 84°-85° C.; [α]25 -10.2° (C=1.26, methanol).

1. temperaturewhilst cooling with ice
2. distillationThe solvent was then distilled off
3. customthe resulting solid was recrystallized from hexane