Triphosgene → 4-isocyanato-1H-indole

Participants

Reaction Steps

4-Aminoindole (0.5 g, 3.78 mmol) in toluene (50 mL) was treated with triphosgene (0.4 g, 1.35 mmol) and heated at reflux for 5 hours. The reaction mixture was allowed to cool to room temperature and concentrated under reduced pressure. The residue was taken up in diethyl ether, filtered, and the filtrate was concentrated under reduced pressure to provide title compound as yellow oil (0.4 g). 1H NMR (300 MHz, CDCl3-d6) δ 6.62 (m, 1H), 6.84 (d, 1H), 7.1 (t, 1H), 7.23 (m, 2H), 8.3 (s, 1H).

Provenance & Evidence