Nitrogen → 1-cyclopropyl-N-[(4,6-dimethyl-2-oxo-1,2-dihydro-3-pyridinyl)methyl]-3-methyl-6-(methylsulfonyl)-1H-indole-4-carboxamide

Participants

Reaction Conditions

Reaction Steps

To a vial under a stream of N2 was added copper(II) trifluoromethanesulfonate (0.084 g, 0.233 mmol), sodium methanesulfinate (0.056 g, 0.467 mmol), DMSO (1.3 mL), and N,N-dimethyletylene diamine (0.053 mL, 0.490 mmol). The deep blue reaction was stirred for 5 min, then was added 6-bromo-1-cyclopropyl-N-[(4,6-dimethyl-2-oxo-1,2-dihydro-3-pyridinyl)methyl]-3-methyl-1H-indole-4-carboxamide (0.10 g, 0.233 mmol). The vial was sealed and heated at 120° C. for 3 h, at which time it was diluted with water (50 ml). The mixture was extracted with 30% THF/EtOAc (2×) (needed to warm to break up emulsion). Combined organics, dried over magnesium sulfate, filtered through Celite, and concentrated. Purification of the residue by column chromatography (12 gram Isco GOLD silica column; gradient B:5-85%; A:dichloromethane, B: 10% (2 M ammonia in MeOH) in chloroform) provided 1-cyclopropyl-N-[(4,6-dimethyl-2-oxo-1,2-dihydro-3-pyridinyl)methyl]-3-methyl-6-(methylsulfonyl)-1H-indole-4-carboxamide (83 mg, 0.184 mmol, 79% yield) as a white solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 11.50 (s, 1 H), 8.38 (t, J=5.1 Hz, 1 H), 8.06 (d, J=1.8 Hz, 1 H), 7.46 (dd, J=7.8, 1.3 Hz, 2 H), 5.87 (s, 1 H), 4.34 (d, J=5.1 Hz, 2 H), 3.52 (tt, J=7.0, 3.6 Hz, 1 H), 3.20 (s, 3 H), 2.23 (s, 3 H), 2.11 (s, 3 H), 2.14 (s, 3 H), 1.09 (m, 2 H), 0.96 (m, 2 H). MS (ES) [M+H]+ 427.8.

Provenance & Evidence