反应详情

A mixture of methyl 1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-[N-tert-butoxycarbonyl-β-(4-chlorophenyl)-D,L-alanylamino]-β-D-ribofuranuronate (150 mg) prepared in Example 64 and anisol (0.3 ml) was stirred in an ice-bath, and trifluoroacetic acid (3 ml) was added. After stirring for 1 hour in an ice-bath, diethyl ether was added to the mixture. The resulting precipitates were collected by filtration, added to 1N sodium hydroxide (3 ml), and stirred for 30 minutes in an ice-bath. The reaction mixture was neutralized with 1N hydrochloric acid, subjected to column chromatography on a non-ionic adsorption resin "HP-20" (trade mark, Mitsubishi Chemical Industries Ltd.) (30 ml). After the column was washed with water, the elution was carried out with 50% aqueous methanol. The eluate was evaporated to remove methanol under reduced pressure and lyophilized to give 1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-[β-(4-chlorophenyl)-D,L-alanylamino]-β-D-ribofuranuronic acid (82 mg), mp. 170°-178° C. (dec.).

1. stirringAfter stirring for 1 hour in an ice-bath
2. customThe resulting precipitates
3. filtrationwere collected by filtration
4. additionadded to 1N sodium hydroxide (3 ml)
5. stirringstirred for 30 minutes in an ice-bath
6. washAfter the column was washed with water
7. washthe elution
8. customThe eluate was evaporated
9. customto remove methanol under reduced pressure