Dimethylformamide → (R)-(4-(4-chlorophthalazin-1-yl)-3-methylpiperazin-1-yl)(4,4-difluorocyclohexyl)methanone

Participants

Reaction Steps

4,4-difluorocyclohexanecarboxylic acid (386 mg, 2.35 mmol) and bis(2-oxo-3-oxazolidinyl)phosphinic chloride (624 mg, 2.45 mmol), DMF (4 mL), and triethylamine (0.57 mL) were stirred at RT for 2 minutes. (R)-1-chloro-4-(2-methylpiperazin-1-yl)phthalazine (JK-2) (537 mg, 2.04 mmol) was added and the reaction stirred at rt for 24 hours. The reaction was then taken up in ethyl acetate (80 mL), washed with aqueous K2CO3 (10%), water, and then saturated sodium chloride. The organics were dried (MgSO4) and evaporated to give a brown oil. Chromatography over silica gel with a gradient of hexanes/0-70% ethyl acetate gave an off-white solid, JK-27. MS (M+H)+=409.1

Provenance & Evidence