Diisopropylethylamine → N-(5-(3-(2-cyanopropan-2-yl)benzamido)-2-methylphenyl)-7-(methylamino)thieno[2,3-b]pyrazine-6-carboxamide

Participants

Reaction Conditions

Reaction Steps

A solution of 7-(methylamino)thieno[2,3-b]pyrazine-6-carboxylic acid 12 (1.6 g, 7.65 mmol), HATU (3.20 g, 8.41 mmol) and DIPEA (3.79 mL, 22.94 mmol) in DMF (20 mL) was stirred at rt for 30 min. N-(3-amino-4-methylphenyl)-3-(2-cyanopropan-2-yl)benzamide hydrochloride 6 (2.52 g, 7.65 mmol) was added and stirred overnight at 75° C. Quenched in ice/water and the resulting precipitate was collected. Purification by chromatography (10-20% EtOAc in CH2Cl2), co-evaporate with acetonitrile (2×), stirred in water at 70° C. for 1 h and filtrated to give the title compound N-(5-(3-(2-cyanopropan-2-yl)benzamido)-2-methylphenyl)-7-(methylamino)thieno[2,3-b]pyrazine-6-carboxamide 13 (2.06 g, 55.6%). 1H-NMR (400 MHz, DMSO-d6) 1.76 (s, 6H), 2.22 (s, 3H), 3.41 (d, J=5.5 Hz, 3H), 7.26 (d, J=8.6 Hz, 1H), 7.60 (t, J=7.8 Hz, 2H), 7.75 (d, J=7.8 Hz, 1H), 7.82 (d, J=1.9 Hz), 1H), 7.94 (d, J=7.8 Hz, 2H), 8.05 (m, 1H), 8.73 (d, J=2.3 Hz, 1H), 8.77 (d, J=2.3 Hz, 1H), 9.55 (br s, 1H), 10.31 (br s, 1H). (m/z)=485 (M+H)+.

Provenance & Evidence