1,2-Diaminocyclohexane, cis- → N-((1R,2S)-2-aminocyclohexyl)-2-(5-methoxy-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 (80.5 mg, 212 μmol.20) and (1R,2S)-cyclohexane-1,2-diamine (20.1 mg, 176 μmol) then 2-(5-methoxy-1-methyl-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (80 mg, 176 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, solvents evaporated and residue purified by chromatography (60 g column, 50 μm from Analogix, 0 to 5% over 15 min (MeOH containing 10% ammonium hydroxide)/dichloromethane to give the desired N-((1R,2S)-2-aminocyclohexyl)-2-(5-methoxy-1-methyl-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (21 mg, 38.2 μmol, 21.7%). MS (M+H)+=550 (>90% purity); 1H NMR (CDCl3) δ: 9.02 (s, 1H), 8.51 (s, 1H), 7.51 (s, 1H), 7.43 (d, J=9.1 Hz, 1H), 7.22 (dd, J=9.3, 2.1 Hz, 1H), 5.61-5.84 (m, 2H), 4.78 (br. s., 1H), 4.18 (s, 3H), 4.02 (t, J=3.2 Hz, 1H), 3.91 (s, 3H), 3.76 (br. s., 1H), 3.62-3.71 (m, 2H), 2.09 (br. s., 2H), 2.03 (s, 2H), 1.80-1.98 (m, 4H), 1.52-1.78 (m, 4H), 0.98 (dd, J=9.3, 7.4 Hz, 2H), 0.00 (s, 9H).

Provenance & Evidence