Dicyclohexylcarbodiimide → HCID 22828235, compound

Participants

Reaction Steps

A mixture of methyl-1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-amino-β-D-ribofuranuronate (294 mg) prepared in Example 62, N-tert-butoxycarbonyl-β-(4-chlorophenyl)-D,L-alanine (300 mg) and N,N'-dicyclohexylcarbodiimide (206 mg) in tetrahydrofuran (15 ml) and water (5 ml) was stirred overnight. The mixture was diluted with water (50 ml) and extracted with ethyl acetate. The extract was washed with water, dried, and evaporated to dryness. The residue was subjected to column chromatography on silica gel. The elution was carried out with a mixed solvent (chloroform/methanol=97/3). The eluate was evaporated to dryness to give methyl 1-(6-amino-9H-purin-9-yl)-1,3-dideoxy-3-[N-tert-butoxycarbonyl-β-(4-chlorophenyl)-D,L-alanylamino]-β-D-ribofuranuronate (203 mg), mp. 120°-125° C.

Provenance & Evidence