Reaction Steps
(±)-tert-Butyl 4-((1-(5-bromo-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethoxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate (40 mg, 0.075 mmol) was dissolved in trifluoroacetic acid (20% in dichloromethane, 1.25 mL) and stirred at room temperature for 30 min. The reaction was concentrated and loaded onto a strong cation exchange cartridge in methanol. The cartridge was flushed with several volumes of methanol which were discarded. The product was eluted with 2M ammonia in methanol and concentrated. 1H-NMR (CDCl3, 500 MHz) δ 10.05 (bs, 1H), 7.90 (s, 1H), 7.73 (d, J=1.5, 1H), 7.25 (m, 2H), 7.10 (d, J=1.5, 1H), 7.05 (m, 2H), 4.48 (q, J=6.4, 1H), 3.39 (d, J=8.9, 1H), 3.25 (d, J=8.9, 1H), 2.91 (m, 1H), 2.84 (m, 1H), 2.75 (m, 1H), 2.68 (m, 1H), 1.60-2.30 (bs, 1H), 2.20 (m, 1H), 2.04 (m, 1H), 1.89 (m, 1H), 1.80 (m, 1H), 1.42 (d, J=6.7, 3H); 13C NMR (126 MHz, CDCl3) δ ppm 162.5, 160.6, 139.5, 135.9, 133.7, 128.7 (d, J=7.7), 128.0, 126.5, 125.5, 122.3, 115.6, 115.4, 113.5, 79.0, 78.2, 50.7, 42.6, 42.5, 41.4, 33.9, 33.6, 22.2.
