Benzene → HCID 123511801, compound

Participants

Reaction Steps

5'-O-(4,4'-dimethoxytrityl)-3'-O-[(dimethyl-1,1-dimethylethyl)silyl]-4'-(7-methanesulfonyloxy-1-hepten-1-yl)-thymidine (219 mg, 0.25 mmole), sodium azide (100 mg, 1.5 mmole) and tetrabutyl ammonium iodide (10 mg, 0.025 mmole) were placed in a dry flask under nitrogen and benzene (5 mL) was added. The mixture was heated under reflux for 14 hours, poured onto ice (15 mL) and extracted four times with dichloromethane (30 mL each). The combined organic extracts were washed with brine (20 mL), dried over magnesium sulfate and the solvent was removed under reduced pressure to provide a white solid. Chromatography on a silica gel column with ethyl acetate/hexane mixtures gave 5'-O-(4,4'-dimethoxytrityl)-3'-O-[(dimethyl-1,1-dimethylethyl)silyl]-4'-(7-azido-1-hepten-1-yl)-thymidine (5) (192 mg, 94%), m.p. 72°-74° C.

Provenance & Evidence