Ethyl chloroformate → HCID 59374990, compound

Participants

Reaction Steps

Ethyl chloroformate (8.19 mg, 0.075 mmol) was added to a solution of 4-(2-fluorophenyl)-7-hydroxy-9H-carbazole-1-carboxamide (Example 40-1, 18.6 mg, 0.058 mmol) in pyridine (1 mL). After 17 h, additional ethyl chloroformate (8.19 mg, 0.075 mmol) was added. After 5 h more, additional ethyl chloroformate (0.05 mL) was added. After 15 h more, the mixture was diluted with EtOAc (30 mL), washed with water (10 mL) and brine (5 mL), dried and concentrated. The residue was purified by preparative HPLC to provide 8-carbamoyl-5-(2-fluorophenyl)-9H-carbazol-2-yl ethyl carbonate as a white solid (7.0 mg, 28%). 1H NMR (400 MHz, chloroform-d) δ 10.44 (1 H, br. s.), 7.62 (1 H, dd, J=7.92, 1.98 Hz), 7.41-7.57 (2 H, m), 7.20-7.40 (4 H, m), 7.16 (1 H, dd, J=7.81, 1.65 Hz), 6.79-6.92 (1 H, m), 6.60 (2H, br. s.), 4.34 (2 H, q, J=7.26 Hz), 1.41 (3 H, t, J=7.15 Hz). Mass spectrum m/z 393.0 (M+H)+.

Provenance & Evidence