Pyrazole → N-(3-nitro-5-(1H-pyrazol-1-yl)phenyl)acetamide

関与物質

反応条件

反応手順

To a solution of N-(3-bromo-5-nitrophenyl)acetamide of Example 1(c) (10 g, 38.6 mmol) in DMF (100 ml) were added pyrazole (5.26 g, 77.2 mmol, 2.0 eq.), copper(I) oxide (1.104 g, 7.72 mmol, 0.2 eq.) and cesium carbonate (25.15 g, 77.2 mmol, 2.0 eq.) and the mixture was heated at 120° C. for 16 h. The mixture was quenched and extracted as in Example 1(d). The solvent was distilled off and the residue was purified by column chromatography over silica gel (30% ethyl acetate in hexane) to afford the compound in 86% yield (8.2 g). 1H NMR (300 MHz, DMSO-d6): δ 10.62 (s, 1H), 8.7 (d, 1H), 8.5-8.48 (m, 2H), 8.32 (t, 1H), 7.84 (d, 1H), 6.62 (t, 1H), 2.08 (s, 3H); LC-MS (ESI): Calculated mass: 246.22; Observed mass: 247.1 [M+H]+ (rt: 0.6 min).

情報源と証拠