[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:9]=[C:10]([C@H:13]3[NH:17][CH2:16][Si:15]([CH3:19])([CH3:18])[CH2:14]3)[NH:11][CH:12]=2)=[CH:4][CH:3]=1.[CH3:20][O:21][C:22]([NH:24][C@@H:25]([CH:29]([CH3:31])[CH3:30])[C:26](O)=[O:27])=[O:23].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.CCN(C(C)C)C(C)C>C(Cl)Cl>[CH3:20][O:21][C:22](=[O:23])[NH:24][C@H:25]([C:26]([N:17]1[C@H:13]([C:10]2[NH:11][CH:12]=[C:8]([C:5]3[CH:6]=[CH:7][C:2]([Br:1])=[CH:3][CH:4]=3)[N:9]=2)[CH2:14][Si:15]([CH3:19])([CH3:18])[CH2:16]1)=[O:27])[CH:29]([CH3:31])[CH3:30]A mixture of (R)-5-[4-(4-bromo-phenyl)-1H-imidazol-2-yl]-3,3-dimethyl-[1,3]azasilolidine (350 mg, 0.92 mmol, Preparation 9), (S)-2-methoxycarbonylamino-3-methyl-butyric acid (170 mg, 0.97 mmol), HATU (400 mg, 1.05 mmol), and DIPEA (700 mg, 5.4 mmol), in DCM (50 mL) was stirred at RT overnight. The reaction mixture was washed with water and brine, dried over Na2SO4, concentrated, and purified by silica gel chromatography (20% EtOAc in petroleum ether) to give the title intermediate (300 mg, 66% yield) as a straw yellow solid. (m/z): [M+H]+ calcd for C21H29BrN4O3Si, 493.12 found 493.1.
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