Phosphorus oxychloride → HCID 57707853, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-methyl-8-(trifluoromethyl)quinoxalin-2-ol (0.8292 g, 3.634 mmol) and phosphorous oxychloride (6.653 mL, 72.68 mmol) was stirred at 100° C. After 1.5 h, the mixture was cooled to room temperature. The mixture was poured into ice (˜50 mL) with stirring and neutralized with NH4OH (30 mL) and ice with stirring. The resulting precipitate was collected by filtration, rinsed with water (100 mL), and dried to give 3-chloro-2-methyl-5-(trifluoromethyl)-quinoxaline as a pink solid: 1H NMR (400 MHz, DMF) 8 ppm 8.35 (1 H, d, J=8.4 Hz), 8.25 (1 H, d, J=7.4 Hz), 7.94-8.02 (1 H, m), 2.80 (3 H, s); LC-MS (ESI) m/z 247.0 [M+H]+. The pink solid was carried on crude without purification for the next step.

Provenance & Evidence