[CH:1]1([CH2:4][O:5][C:6]2[CH:14]=[CH:13][C:9]([C:10]([OH:12])=O)=[CH:8][CH:7]=2)[CH2:3][CH2:2]1.[C:15]([NH:18][C@@H:19]([CH3:43])[CH2:20][O:21][C:22]1[CH:27]=[C:26]([S:28][CH2:29][CH2:30][C:31]([O:33][CH2:34][CH:35]([CH2:40][CH3:41])[CH2:36][CH2:37][CH2:38][CH3:39])=[O:32])[C:25]([NH2:42])=[CH:24][N:23]=1)(=[O:17])[CH3:16].CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.C(N(CC)C(C)C)(C)C>O.CN(C=O)C>[C:15]([NH:18][C@@H:19]([CH3:43])[CH2:20][O:21][C:22]1[CH:27]=[C:26]([S:28][CH2:29][CH2:30][C:31]([O:33][CH2:34][CH:35]([CH2:40][CH3:41])[CH2:36][CH2:37][CH2:38][CH3:39])=[O:32])[C:25]([NH:42][C:10](=[O:12])[C:9]2[CH:8]=[CH:7][C:6]([O:5][CH2:4][CH:1]3[CH2:2][CH2:3]3)=[CH:14][CH:13]=2)=[CH:24][N:23]=1)(=[O:17])[CH3:16]A mixture of 4-(cyclopropylmethoxy)benzoic acid (452 mg), 2-ethylhexyl 3-((2-(((2S)-2-acetamidopropyl)oxy)-5-aminopyridin-4-yl)sulfanyl)propanoate (1.00 g), HATU (0.893 g), N,N-diisopropylethylamine (0.821 mL) and DMF (10 mL) was stirred at 70° C. for 5 days. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The combined organic layer were washed with saturated brine, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (0.740 g).
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