[OH:1][CH2:2][C:3]([NH:6][C:7]1[S:8][CH:9]=[C:10]([C:12]2[N:16]([CH3:17])[CH:15]=[C:14]([C:18]#[N:19])[CH:13]=2)[N:11]=1)([CH3:5])[CH3:4].C(N(CC)CC)C.Cl[C:28](Cl)([O:30]C(=O)OC(Cl)(Cl)Cl)Cl>O1CCCC1>[CH3:4][C:3]1([CH3:5])[CH2:2][O:1][C:28](=[O:30])[N:6]1[C:7]1[S:8][CH:9]=[C:10]([C:12]2[N:16]([CH3:17])[CH:15]=[C:14]([C:18]#[N:19])[CH:13]=2)[N:11]=1To a solution of 5-{2-[(2-hydroxy-1,1-dimethylethyl)amino]-1,3-thiazol-4-yl}-1-methyl-1H-pyrrole-3-carbonitrile (1.10 g, 3.98 mmol), prepared in the previous step, in dry tetrahydrofuran (10 mL) under nitrogen was added triethylamine (0.56 mL, 4 mmol), followed by triphosgene (1.18 g, 4 mmol). After 2 h, the mixture was partitioned between water and ethyl acetate. The organic layers were washed with water, dried (anhydrous sodium sulfate) and evaporated. The residue was then purified by silica gel column chromatography (ethyl acetate:hexanes, gradient elution) to afford the title compound (0.80 g, 66%) as an off white powder. HRMS: calcd for C14H14N4O2S [M+H]+, 303.09102; found (ESI, [M+H]+), 303.093, ANLC 99.4% at 210-370 nm, 8.6 min; 99.7% at 246 nm, 8.6 min, the Xterra® RP18 column, 3.5%, 150×4.6 mm column, 1.2 mL/min, 85/15-5/95 (Ammon. Form. Buff. pH=3.5/ACN+MeOH) for 10 min, hold 4 min.
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