Tert-Butylamine → N-tert-butyl-2-(5-(difluoromethoxy)-1-methyl-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide

Participants

Reaction Conditions

Reaction Steps

In a 16×100 mm screw cap test tube were added HATU (28.0 mg, 73.5 μmol.20) and 2-methylpropan-2-amine (17.9 mg, 245 μmol) then 2-(5-(difluoromethoxy)-1-methyl-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (30 mg, 61.3 μmol) dissolved in DMF (2.00 mL) was added to give a light yellow solution which immediately formed a white precipitated. The reaction mixture stirred at 25° C. overnight. TLC and LCMS showed incomplete reaction, added 2-methylpropan-2-amine (17.9 mg, 245 μmol) and HATU (28.0 mg, 73.5 μmol.20) then the reaction continued at 25° C. for 3 h. Solvents evaporated and residue purified by chromatography (spherical silica 20-45 μm, 23 g, Versaflash Supelco) eluting with 0 to 50% EtOAc in hexanes over 30 min to yield N-tert-butyl-2-(5-(difluoromethoxy)-1-methyl-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (33.4 mg, 61.3 μmol, 100%) as an off-white solid. 1H NMR (CDCl3) δ: 9.21 (s, 1H), 8.35 (s, 1H), 8.29 (d, J=2.3 Hz, 1H), 8.04 (s, 1H), 7.44-7.53 (m, 1H), 7.30-7.38 (m, 1H), 7.27 (s, 2H), 6.39 (t, J=74.0 Hz, 1H), 5.72 (s, 2H), 4.21 (s, 3H), 3.50-3.65 (m, 2H), 1.61 (s, 9H), 0.86-1.07 (m, 2H), −0.04 (s, 9H).

Provenance & Evidence