Methyl iodide → HCID 20381973, compound

Participants

Reaction Steps

To a suspension of 32 mg (0.0013 mole) of oil-free sodium hydride in 25 ml of glyme is added 227 mg (0.001 mole) of 2-(hydroxymethyl)-6-methylpyrazolo[1,5-c]quinazolin-5(6H)-one. The suspension is stirred for 15 minutes and then a solution of 0.66 ml (0.0107 mole) of methyl iodide in 2 ml of hexamethylphosphoric triamide added. The reaction mixture is stirred for 18 hours at room temperature. The solution is filtered and the filtrate stripped to an oil which is partitioned between dichloromethane and aqueous sodium thiosulfate. The organic phase is washed with water and stripped to an oil which is dissolved in acetone and applied to a Merck silica gel plate (20 cm × 20 cm × 2 mm thick). The chromatogram is developed with chloroform-methanol (9:1) and the product is eluted off with acetone. Evaporation of the acetone gives an oil that solidifies on standing under pentane at 5°. The yield of title compound is 100 mg (41%), m.p. 98°-100°.

Provenance & Evidence