2-Chloropropane → 1-Isopropyl-4-[6-(4-trifluoromethylphenyl)pyridazin-3-yl]-[1,4]diazepane, dihydrochloride

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4-[6-(4-Trifluoromethylphenyl)pyridazin-3-yl][1,4]diazepane, dihydrochloride (0.028 g, 0.071 mmol) was suspended in THF (4 mL) and triethylamine (0.022 g, 0.21 mmol) was added. Sodium hydride (0.0085 g, 0.35 mmol) was added and the reaction mixture was stirred at rt for 20 min. Dry N,N-dimethylformamide (1 mL) and 2-chloropropane (0.056 g, 0.71 mmol) was added and the reaction mixture was heated 30 min at 160° C. and 30 min at 180° C. in a microwave oven. The reaction mixture was purified on a silicagel column (0.04-0.063 mesh) using dichloromethane/MeOH (9:1) as eluent. This afforded a crude oil containing several components that was purified further by preparative HPLC using Method B. This afforded 9 mg of an oil which was dissolved into MeOH. Addition of HCl in diethyl ether afforded 6.5 mg (21%) of the title compound as an oily dihydrochloride.

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