Potassium Carbonate → Penciclovir

Participants

Reaction Steps

A mixture of 2-amino-6-chloropurine (1.275 g, 7.5 mmol) and potassium carbonate (0.69 g, 5 mmol) in dry dimethylformamide (30 ml) was sonicated for 15 min., benzyl 2-benzyloxymethyl-4-bromobutyl ether (1.82 g, 5 mmol) was added, and the mixture was sonicated for 4h and then stirred over-night. After evaporation in vacuum the residue was extracted with 3×50 ml of chloroform and the extracts were evaporated to dryness in vacuum. Chromatography (silica gel, chloroform+methanol 20+1 by volume) afforded 0.58 g (26%) of pure compound 4-(2-amino-6-chloropurin-9-yl)-2-benzyloxymethylbutyl benzyl ether. A small sample of said compound was recrystallized from toluene. M.p. 108.5°-109.5° C.

Provenance & Evidence