Triphenylphosphine → HCID 66606356, compound

Participants

Reaction Steps

Step 1 A mixture of 4-bromo-7-(hydroxymethyl)-9H-carbazole-1-carboxamide (Example 30-2, 403 mg, 1.263 mmol), N-chlorosuccinimide (219 mg, 1.642 mmol) and triphenylphosphine (431 mg, 1.642 mmol) in DCM (50 mL) was heated at reflux for 1 h. The mixture was cooled to rt, washed with brine, and the aqueous layer was extracted with DCM. The aqueous layer was filtered and the collected precipitate was washed with water. The organic layers and the collected precipitate were combined and the mixture was concentrated under vacuum. The residue was dissolved in THF (20 mL) and DMSO (5 mL) and the solution was treated with sodium thiomethoxide (115 mg, 1.642 mmol). The mixture was stirred at rt for 30 min, diluted with EtOAc, washed twice with water, and the aqueous phase was extracted with EtOAc. The combined organic phases were dried and concentrated. The residue was purified by column chromatography (eluting with EtOAc-hexane) to provide 4-bromo-7-(methylthiomethyl)-9H-carbazole-1-carboxamide as a white solid (168 mg, 38%) used without further purification. 1H NMR (400 MHz, chloroform-d) δ 8.67 (1H, d, J=8.1 Hz), 7.46-7.52 (2H, m), 7.36-7.41 (1H, m), 7.26-7.29 (1H, m), 3.87 (2H, s), 2.03 (3H, s). Mass spectrum m/z 349, 351 (M+H)+.

Provenance & Evidence