[NH2:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][C@H:12]([OH:14])[CH3:13])[N:6]=[C:5]2[C:15]#[N:16].N1C=CN=C1.[Si:22](Cl)([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[NH2:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([CH2:11][C@H:12]([O:14][Si:22]([C:25]([CH3:28])([CH3:27])[CH3:26])([CH3:24])[CH3:23])[CH3:13])[N:6]=[C:5]2[C:15]#[N:16](R)-5-amino-1-(2-hydroxypropyl)-1H-indazole-3-carbonitrile (180 mg, 0.832 mmol) was taken up in DCM (6 mL) and imidazole (227 mg, 3.33 mmol) and DMAP (10.17 mg, 0.083 mmol) were added, followed by TBS-Cl (439 mg, 2.91 mmol). The reaction was stirred at room temperature overnight. The reaction mixture was quenched with saturated NH4Cl solution and diluted with DCM. The organic layer was collected and washed with brine, dried over Na2SO4, filtered, and concentrated. The crude material was purified by flash column chromatography eluting with 0-40% EtOAc/Hex. (R)-5-amino-1-(2-((tert-butyldimethylsilyl)oxy)propyl)-1H-indazole-3-carbonitrile (230.5 mg) was obtained as an orange solid.
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