Tetrahydrofuran → Tert-butyl 3-(4-(1-isopropyl-7-oxo-1,4,6,7-tetrahydrospiro[indazole-5,4'-piperidine]-1'-ylcarbonyl)-6-methoxypyridin-2-yl)benzoate

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A solution of 2-(4-(tert-butoxycarbonyl)phenyl)-6-methoxyisonicotinic acid (500 mg, 1.52 mmol) and 1,1-carbonyldiimidazole (271 mg, 1.67 mmol) in tetrahydrofuran (30 mL) was stirred at reflux for 1 hr. After cooling to room temperature 1-isopropyl-4,6-dihydrospiro[indazole-5,4′-piperidin]-7(1H)-one (539 mg, 1.68 mmol) and triethylamine (0.32 mL, 2.28 mmol) were added sequentially and the resulting slurry was heated at reflux temperature for 1 hr. After cooling, the reaction mixture was diluted into ethyl acetate, washed with 1N aqueous hydrochloric acid, saturated aqueous sodium chloride, dried over sodium sulfate to afford tert-butyl 3-(4-(1-isopropyl-7-oxo-1,4,6,7-tetrahydrospiro[indazole-5,4′-piperidine]-1′-ylcarbonyl)-6-methoxypyridin-2-yl)benzoate (850 mg) as a white foam. This material was taken onto the next step without further purification. 1H NMR (400 MHz, CDCl3) δ ppm 8.60 (t, J=1.66 Hz, 1H), 8.20 (dt, J=8.05, 1.44 Hz, 1H), 8.01 (dt, J=7.80, 1.37 Hz, 1H), 7.50 (t, J=7.80 Hz, 1H), 7.36 (s, 1H), 7.33 (d, J=0.98 Hz, 1H), 6.64 (d, 1H), 5.35 (spt, J=6.44 Hz, 1H), 4.04 (s, 3H), 3.71-3.84 (m, 2H), 3.36-3.42 (m, 2H), 2.79 (d, J=2.34 Hz, 2H), 2.58 (s, 2H), 1.66-1.72 (m, 2H), 1.61 (s, 9H), 1.56 (s, 2H), 1.40-1.48 (m, 6H); m/z (M+1)=559.2.

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