Hydrochloric Acid → 2-Chloro-9-cyclohexyl-7,7-difluoro-5,7,8,9-tetrahydro-pyrimido[4,5-b][1,4]diazepin-6-one

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Reaction Conditions

Reaction Steps

In a round bottom flask compound ethyl 4-((2-chloro-5-nitropyrimidin-4-yl)(cyclohexyl)amino)-3,3-difluoro-2-oxobutanoate (11.85 g, 31.35 mmol) was dissolved in acetic acid (30 mL), and added iron powder (3.51 g, 62.7 mmol) to it. Then cooled the round bottom flask to 0° C. in an ice bath. After 10 min, added conc.HCl (12 mL) dropwise using addition funnel and continued the reaction at 60° C. on a preheated oil bath until starting material disappear. It was then concentrated in vacuo, diluted with EtOAc, basified with 10% NaOH solution at 0° C. The whole was filtered through celite, washed with EtOAc. The filtrate was then separated. The organic layer was dried over Na2SO4. The solution was concentrated in vacuo followed by precipitation from ether to afford the desired compound (6.0 g, 62% yield) as yellow solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 0.96-1.85 (m, 10 H) 4.02 (t, J=11.37 Hz, 2 H) 4.47 (m, 1 H) 8.11 (s, 1 H) 11.02 (br. s., 1 H). [M+H] calc'd for C13H15ClF2N4O, 317; found 317.

Provenance & Evidence