反应详情

Alternatively, method (Ex. 5-b), 1.2 equivalents of isobutyl chloroformate are added, at 0° C., to a solution of 1 g of Compound 1 in THF with 1.2 equivalents of triethylamine. After 2 hours at room temperature, the reaction medium is added to a cooled solution of ammonia, either at 28% in water or at 2N in isopropanol. The medium is stirred at room temperature for the time required, and then concentrated under vacuum. The crude product is then taken up in toluene, to give Compound 2 after precipitation. Yield=60%

1. concentrationconcentrated under vacuum