[CH2:1]([N:5]1[C:10](=[O:11])[CH2:9][NH:8][C:7]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[OH:18])=N1)[CH2:2][CH2:3][CH3:4].[CH2:19](N(CC)CC)C.Cl[C:27](Cl)([O:29]C(=O)OC(Cl)(Cl)Cl)Cl>ClCCl>[CH2:1]([N:5]1[CH:19]=[C:7]2[N:8]([C:27](=[O:29])[O:18][C:13]3[C:12]2=[CH:17][CH:16]=[CH:15][CH:14]=3)[CH2:9][C:10]1=[O:11])[CH2:2][CH2:3][CH3:4]To a solution of Compound 83 (0.21 g, 0.85 mmol) dissolved in 5 mL dichloromethane, was added triethylamine (0.13 mL, 0.94 mmol). The solution was cooled to 0° C. in an ice bath, and triphosgene (0.28 g, 0.94 mmol) was added. After 15 min, the cooling bath was removed. After the reaction stirred for 45 minutes at room temperature, the reaction was complete by TLC. The reaction was quenched with saturated sodium bicarbonate solution. The organic layer was washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo. Flash column chromatography (15-20% ethyl acetate/hexanes), afforded 90 mg (39% yield) of Compound 25 as a yellow oil.
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