Chloroform → HCID 57818738, compound

Participants

Reaction Steps

5-fluoro-2-(4-fluorobenzyloxy)pyrimidin-4-amine (300 mg, 1.26 mmol) was stirred in chloroform (25 mL) and water (12 mL). Sodium bicarbonate (870 mg, 10.12 mmol) was added followed by dropwise addition of thiophosgene (218 mg, 1.9 mmol). The reaction mixture was stirred at room temperature for 16 hours, then diluted with chloroform (20 mL) and the phases were separated. The organic extract was dried over sodium sulfate, filtered, and concentrated by rotary evaporation to ⅓ volume. To this chloroform solution of crude isothiocyanate was added abs. ethanol (10 mL) and the mixture was heated in a sealed tube for 1 h. The reaction mixture was cooled to room temperature, concentrated and purified by flash chromatography on silica, to give 45 mg (11%) of O-ethyl 5-fluoro-2-(4-fluorobenzyloxy)pyrimidin-4-ylcarbamothioate as a pale yellow solid: mp 109-119° C.; 1H NMR (CDCl3) δ 8.30 (bs, 2H), 7.44 (m, 2H), 7.06 (m, 2H), 5.36 (s, 2H), 4.66 (q, J=6 Hz, 2H), 1.45 (t, J=6 Hz, 3H); HPLC-MS (ESI): m/z 326 (ES+).

Provenance & Evidence