[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[N:8]([CH3:12])[CH:7]=[C:6]2[C:13]1[N:23]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:31])([CH3:30])[CH3:29])[C:16]2=[N:17][CH:18]=[C:19]([CH2:21][NH2:22])[N:20]=[C:15]2[CH:14]=1.N1C=CC=CC=1.[C:38](Cl)(=[O:45])[C:39]1[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=1>C1COCC1.C([O-])([O-])=O.[Na+].[Na+]>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[N:8]([CH3:12])[CH:7]=[C:6]2[C:13]1[N:23]([CH2:24][O:25][CH2:26][CH2:27][Si:28]([CH3:30])([CH3:29])[CH3:31])[C:16]2=[N:17][CH:18]=[C:19]([CH2:21][NH:22][C:38](=[O:45])[C:39]3[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=3)[N:20]=[C:15]2[CH:14]=1(6-(5-Methoxy-1-methyl-1H-indol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)methanamine (0.095 g, 0.28 mmol, Example #20, Step G) in THF (5 mL) was treated with pyridine (0.026 ml, 0.33 mmol) and benzoyl chloride (0.033 ml, 0.28 mmol). The mixture was stirred for about 20 min at about 60° C. and cooled to ambient temperature, diluted with aqueous Na2CO3 (15 mL), and extracted with EtOAc (20 mL). The organic solution was dried over anhydrous MgSO4, filtered, and concentrated to give N-((6-(5-methoxy-1-methyl-1H-indol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)methyl)benzamide (0.118 g, 100%): LC/MS (Table 2, Method d) Rt=1.64 min; MS m/z: 542 (M+H)+.
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