Succinic anhydride → HCID 59456977, compound

Participants

Reaction Steps

A solution of 3-(6-aminopyridin-3-yl)-N-methyl-N-(1-methyl-1H-indol-2-ylmethyl)acrylamide (1.40 g, 4.37 mol) and succinic anhydride (520 mg, 5.24 mmol) in 1,4-dioxane (50 mL) was heated to reflux for 5 h. Another portion of succinic anhydride (520 mg, 5.24 mmol) was then added, and the solution was maintained at reflux overnight. The solvent was removed in vacuo. The residue was dissolved in CH2Cl2, and the solution was washed with satd NaHCO3, water and brine, dried over Na2SO4, and concentrated. Purification by column chromatography (silica gel, CH2Cl2/MeOH, 98:2 to 97:3) gave the title compound (1.40 g, 76%) as an off-white solid and as a mixture of amide rotamers: mp 185-187° C.; 1H NMR (300 MHz, DMSO-d6) δ 8.92-8.88 (m, 1H), 8.41-8.32 (m, 1H), 7.69-7.64 (m, 1H), 7.52-7.34 (m, 4H), 7.15-7.09 (m, 1H), 7.04-6.99 (m, 1H), 6.44-6.21 (m, 1H), 5.08-4.87 (m, 2H), 3.73-3.70 (m, 3H), 3.14-3.00 (m, 3H), 2.83-2.81 (m, 4H); MS (ESI) m/e 403 (M+H)+.

Provenance & Evidence