trans-2-Phenyl-1-cyclopropanecarbonyl chloride → N-(7-chloro-2-methylpyrazolo[1,5-a]pyrimidin-5-yl)-2-phenylcyclopropanecarboxamide

Participants

Reaction Steps

In a 250 ml round-bottomed flask was added (+/−)-trans-2-phenylcyclopropanecarbonyl chloride (1.9 g, 10 mmol) in pyridine (94 ml) to give a yellow suspension. 7-Chloro-2-methylpyrazolo[1,5-a]pyrimidin-5-amine (1J, 1.7 g, 9.4 mmol) was added portionwise at 0° C. The temperature was slowly raised to room temperature. After 30 min, reaction was complete and was quenched with saturated sodium bicarbonate solution. The layers were extracted with ethyl acetate (3×100 mL), and the organic layers were washed with saturated sodium bicarbonate solution and concentrated in vacuo. The residue was suspended in methanol and filtered. The filtrate was concentrated to obtain the product N-(7-chloro-2-methylpyrazolo[1,5-a]pyrimidin-5-yl)-2-phenylcyclopropanecarboxamide (8C, 1.9 g, 62%) as an orange solid. 1H NMR (DMSO-d6) δ: 11.39 (s, 1H), 7.99 (s, 1H), 7.27-7.34 (m, 2H), 7.15-7.25 (m, 3H), 6.39 (s, 1H), 2.46 (td, 1H), 2.41 (s, 3H), 2.30-2.37 (m, 1H), 1.50-1.58 (m, 1H), 1.46 (ddd, J=8.2, 6.6, 4.2 Hz, 1H). ESI-MS: m/z 327.2 (M+H)+.

Provenance & Evidence