Potassium Phosphate, Tribasic → (E)-3,9-dimethyl-6-(2-(pyridin-4-yl)prop-1-enyl)-1,2,3,4,5,6-hexahydroazepino[4,5-b]indole

Participants

Reaction Conditions

Reaction Steps

3,9-Dimethyl-1,2,3,4,5,5a,6,10b-octahydroazepino[4,5-b]indole (107.5 mg, 0.5 mmol), potassium phosphate tribasic (212 mg, 1 mmol) in DMF and the mixture purged with nitrogen. The reaction mass was heated at 85° C. for 5 min. In another flask was added 4-(1-bromoprop-1-en-2-yl)pyridine (107.83 mg, 0.55 mmol), L-proline (11.5 mg, 0.1 mmol), CuI (9.5 mg, 0.05 mmol) in DMF. This mixture was purged with nitrogen and heated at 90° C. for 5 min. The reaction mixtures were combined and heated at 90° C. overnight. The reaction mass was poured into water to obtain a precipitate. The precipitate was filtered and purified with silica column chromatography (100-200 mesh), by neutralizing the silica gel with 2-3 drops of aq. ammonia and using 0-2% MeOH:DCM as eluant. The compound was further purified by reverse phase HPLC to obtain the product. 1HNMR (CD3OD, TFA salt) δ (ppm): 8.70 (d, 2H), 8.10 (d, 2H), 7.62 (s, 1H), 7.38 (s, 1H), 7.05 (d, 2H), 3.80 (m, 2H), 3.40 (m, 2H), 3.30 (m, 2H), 3.20 (m, 2H), 3.05 (s, 3H), 2.42 (s, 3H), 2.05 (s, 3H).

Provenance & Evidence