6-Chloro-3-methyl-(1,2,4)triazolo(4,3-b)pyridazine → (R)-N,3-dimethyl-N-(1-phenylethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-amine

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6-Chloro-3-methyl-[1,2,4]triazolo[4,3-b]pyridazine (120 mg, 0.712 mmol; commercially available or prepared according to patent WO2006/039325A2), (S)-N-methyl-1-phenylethanamine (385 mg, 2.85 mmol) and anhydrous NMP (1 mL) were charged into a microwave tube equipped with a magnetic stirbar. After the vessel was sealed, the mixture was heated at 200° C. for 60 min using microwave irradiation. The reaction was purified by normal phase chromatography (10% CH2Cl2 in hexane then a gradient of 0% to 20% MeOH in CH2Cl2) and by reverse phase chromatography before being lyophilized to give the (S)-N,3-dimethyl-N-(1-phenylethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-amine (Compound 3) as an off-white solid (69 mg; 36% yield). 1H NMR (400 MHz, DMSO-d6): δ 8.01 (d, J=10.1 Hz, 1H), 7.25-7.39 (m, 6H), 5.71 (q, J=6.9 Hz, 1H), 2.84 (s, 3H), 2.54 (s, 3H), 1.58 (d, J=6.9 Hz, 3H). LRMS [M+H]+: 268 m/z.

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