Cesium carbonate → 5-Bromo-1-(2-(pyrrolidin-1-yl)ethyl)-3-(trifluoromethyl)-1H-indazole

関与物質

反応手順

A solution of 5-bromo-3-(trifluoromethyl)-1H-indazole (282 mg, 1.07 mmol) in DMSO (15 mL) was treated with Cs2CO3 (1.45 g, 4.45 mmol) and 1-(2-chloroethyl)pyrrolidine hydrochloride (376 mg, 2.21 mmol). After stirring for 16 hours at room temperature, the mixture was diluted with water (50 mL) and extracted with EtOAc (3×50 mL). The combined organics were washed with brine (50 mL), dried over Na2SO4, filtered and concentrated to dryness. Purification by flash column chromatography (silica gel, MeOH/EtOAc/hexanes, 0:1:1 to 1.49:50) gave the title compound (250 mg, 65%) as a light yellow oil: 1H NMR (500 MHz, CDCl3) δ 7.98 (s, 1H), 7.54 (dd, J=8.9, 1.7 Hz, 1H), 7.40 (d, J=8.9, 1H), 4.54 (t, J=7.1 Hz, 2H), 3.01 (t, J=7.1 Hz, 2H), 2.56-2.54 (m, 4H), 1.79-1.75 (m, 4H); ESI MS m/z 362 [M+H]+.

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