Potassium Carbonate → HCID 178437994, compound
Reaction equation
[C:1]([O:5][C:6]([N:8]1[CH2:13][CH2:12][CH:11]([C:14]2[CH:15]=[C:16]3[C:20](=[CH:21][CH:22]=2)[N:19](C(OC(C)(C)C)=O)[N:18]=[C:17]3[C:30]#[C:31][Si](C)(C)C)[CH2:10][CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].C(=O)([O-])[O-].[K+].[K+]>CCO>[C:30]([C:17]1[C:16]2[C:20](=[CH:21][CH:22]=[C:14]([CH:11]3[CH2:12][CH2:13][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[CH2:9][CH2:10]3)[CH:15]=2)[NH:19][N:18]=1)#[CH:31]Participants
4
Procedure
A solution of tert-butyl 5-[1-(tert-butoxycarbonyl)piperidin-4-yl]-3-[(trimethylsilyl)ethynyl]-1H-indazole-1-carboxylate (189 mg; 0.38 mmol; 1.0 eq.) and potassium carbonate (5.3 mg; 0.04 mmol; 0.1 eq.) in EtOH (3.8 mL) was stirred at RT O/N. EtOH was removed under reduced pressure and the residue was diluted with ether, washed with water then brine, dried over magnesium sulfate, filtered and concentrated. The crude was purified by flash chromatography on silica (heptane/EtOAc, gradient from 90:10 to 60:40) to give the title compound as a beige solid (118 mg, 95%). 1H NMR (300 MHz, DMSO-d6) δ 13.35 (brs, 1H), 7.55-7.47 (m, 2H), 7.33 (dd, J=1.6, 8.6 Hz, 1H), 4.48 (s, 1H), 4.15-4.03 (m, 2H), 2.93-2.71 (m, 3H), 1.86-1.74 (m, 2H), 1.65-1.45 (m, 2H), 1.42 (s, 9H). HPLC (Condition A): Rt 4.78 min (purity 99.1%).