Methyl iodide → 2-Chloro-9-cyclopentyl-7-ethyl-7-fluoro-5-methyl-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one

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Reaction Steps

To a solution of 2-chloro-9-cyclopentyl-7-ethyl-7-fluoro-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one (890 mg, 2.85 mmol) in 10 mL of DMA was added sodium hydride (60% dispersion in mineral oil, 116 mg, 2.9 mmol) at 0° C., followed by the dropwise addition of methyl iodide (0.18 mL, 2.9 mmol). The reaction mixture was warmed up to rt and stirred for 1 h. The whole was poured into ice-water, extracted with ethyl acetate. The organic layer was washed with brine and dried over Na2SO4. The solution was concentrated in vacuo followed by precipitation from ether/EtOA to afford the product (750 mg, 80% yield) as light tan solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 0.90 (t, J=7.3 Hz, 3 H) 1.55-1.98 (m, 10 H) 3.28 (s, 3 H) 3.70-3.93 (m, 2 H) 4.74 (t, J=7.9 Hz, 1 H) 8.25 (s, 1 H). [M+H] calc'd for C15H20ClFN4O, 327; found 327.

Provenance & Evidence