Water → 8-Benzyl-7,8-dihydro-5-methyl-6H-pyrazolo[1,5-a]pyrrolo-[3,2-e]pyrimidine

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Reaction Steps

A solution of 1.15 g (5 mmoles) of 7-chloro-6-(2-chloroethyl)-5-methylpyrazolo[1,5-a]pyrimidine (prepared as described in Example 3), 643 mg (6 mmoles) of benzylamine and 2 ml of triethylamine dissolved in 5 ml of isopropanol was heated under reflux for 7 hours, with stirring. The reaction mixture was then poured into water and extracted with ethyl acetate. The organic layer was extracted with 5% by volume aqueous sulfuric acid, and the extract was made basic by the addition of sodium carbonate. The crystals which precipitated were collected by filtration and washed with water. They were then purified by column chromatography through silica gel (eluted with chloroform) and recrystallized from a mixture of ethyl acetate and chloroform, to afford 788 mg (yield 60%) of the title compound as colorless needles, melting at 130°-130.5° C.

Provenance & Evidence