Water → HCID 21396261, compound

Participants

Reaction Steps

A mixture of 2-amino-6-chloropurine (3.0 g) and anhydrous potassium carbonate (2.44 g) in dry dimethylformamide (50 ml) was stirred at room temperature for several hours. To this mixture was added 5 g of 2-(2-benzoyloxyethoxy)ethoxymethyl chloride. The reaction mixture was stirred at room temperature for 4 days and then poured into ice and water. The resulting mixture was extracted with chloroform (3X) and the chloroform extract washed with 10% aqueous acetic acid, with water and then dried over anhydrous sodium sulfate. The solution was filtered and the chloroform evaporated at room temperature and reduced pressure (initially about 20 mm and finally about 1 mm Hg). The residual yellow oil was applied to a column containing silica gel (200 g) in 1:1 ether:chloroform. The column was eluted with 1:1 ether:chloroform followed by chloroform followed by methanol (5%):chloroform (95%). The desired product, 2-amino-6-chloro-9-[2-(2-benzoyloxyethoxy)ethoxymethyl]purine, was eluted in the methanol: chloroform eluate. The fraction exhibiting a single spot on silica gel thin layer chromatography [mobile phase methanol (2%): chloroform (98%)] were combined and evaporated to give a pale yellow oil which gradually solidified. This was recrystallized from benzene to give 2-amino-6-chloro-9-[2-(2-benzoyloxyethoxy)ethoxymethyl]purine 1.5 g), m.p. 111°-112° C.

Provenance & Evidence