Ethanol → HCID 11799355, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of N-benzyloxycarbonyl-(L)-isoleucyl-(L)-tryptophanol (55 g), palladium-carbon (5%, 50% wet, 30 g) and ethanol (50 ml)-THF (300 ml) was subjected to catalytic hydrogenation at room temperature and atomospheric pressure. After the catalyst was filtered off, the filterate was concentrated under reduced pressure to yield an oily substance. The oil was dissolved in N,N-dimethylformamide (300 ml), and 1-naphthalenesulfonyl chloride (30 g) and 4-(N,N-dimethylamino)pyridine (DMAP) (17 g) were added to the ice-cooling mixture. After stirring at 0° C. for 2 hours, the reaction mixture was concentrated under reduced pressure. The residue was suspended in ethyl acetate and the mixture was successively washed with 10% aqueous citric acid solution, water, saturated aqueous sodium hydrogen carbonate and brine, and dried (MgSO4). The organic solvent was evaporated off and the residual oil was purified by column chromatography on silica gel. Elution with ethyl acetate-hexane (3:2,v/v) gave N-(1-naphthylsulfonyl)-(L)-isoleucyl-(L)-tryptophanol (51 g, 82%) as crystals.

Provenance & Evidence