Methyl iodide → 2-Chloro-9-cyclopentyl-5,7,7-trimethyl-5,7,8,9-tetrahydro-pyrimido[4,5-b][1,4]diazepin-6-one

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Reaction Steps

To a solution of 18.43 g (0.187 mole) of 2-chloro-9-cyclopentyl-7,7-dimethyl-5,7,8,9-tetrahydro-pyrimido[4,5-b][1,4]diazepin-6-one (VI-38) and 500 mL of dimethylformamide was added 26.6 g (0.187 mole) of iodomethane and 30.6 g (0.0939 mole) of cesium carbonate. The mixture was stirred overnight at ambient temperature. The mixture was then filtered and concentrated under reduced pressure. The residue was partitioned between 500 mL of ethyl acetate and 200 mL of water. The aqueous layer was extracted twice with 200 mL of ethyl acetate. The combined organic extracts were washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 18.47 g of 2-chloro-9-cyclopentyl-5,7,7-trimethyl-5,7,8,9-tetrahydro-pyrimido[4,5-b][1,4]diazepin-6-one (VII-38) as an off-white solid.

Provenance & Evidence