Br[CH2:2][CH:3]1[CH2:6][C:5]([CH2:29][C:30]#[N:31])([N:7]2[CH:11]=[C:10]([C:12]3[C:13]4[CH:20]=[CH:19][N:18]([CH2:21][O:22][CH2:23][CH2:24][Si:25]([CH3:28])([CH3:27])[CH3:26])[C:14]=4[N:15]=[CH:16][N:17]=3)[CH:9]=[N:8]2)[CH2:4]1.[BH4-].[Na+]>CN(C=O)C>[CH3:2][CH:3]1[CH2:4][C:5]([CH2:29][C:30]#[N:31])([N:7]2[CH:11]=[C:10]([C:12]3[C:13]4[CH:20]=[CH:19][N:18]([CH2:21][O:22][CH2:23][CH2:24][Si:25]([CH3:27])([CH3:26])[CH3:28])[C:14]=4[N:15]=[CH:16][N:17]=3)[CH:9]=[N:8]2)[CH2:6]13-(Bromomethyl)-1-[4-(7-[2-(trimethylsilyl)ethoxy]methyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]cyclobutylacetonitrile (0.65 g, 0.0013 mol) was reacted with sodium tetrahydroborate (0.096 g, 0.0026 mol) in DMF (5.2 mL) (˜0.5 M) at rt under nitrogen for 3h. The reaction was quenched with water and extracted with dichloromethane. The organic layers were washed with water, brine, dried over MgSO4 and concentrated to give a yellow oil, the desired product as cis- and trans-isomer mixtures. LCMS calculated for C22H31N6OSi(M+H)+: 423.2; Found: 423.4.
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