[N:1]1[CH:6]=[CH:5][CH:4]=[N:3][C:2]=1[NH:7][CH2:8][CH2:9][O:10][C:11]1[CH:19]=[CH:18][C:14]([C:15]([OH:17])=O)=[CH:13][CH:12]=1.Cl.C(OC(N[C@@H:32]([CH2:40][NH2:41])[C:33]([O:35][C:36]([CH3:39])([CH3:38])[CH3:37])=[O:34])=O)C1C=CC=CC=1.C[N:43]1CCOCC1.CN([P+](ON1N=N[C:62]2[CH:63]=[CH:64][CH:65]=[CH:66][C:61]1=2)(N(C)C)N(C)C)C.F[P-](F)(F)(F)(F)F.C[CH2:77][O:78][C:79](C)=[O:80]>CN(C=O)C>[C:36]([O:35][C:33](=[O:34])[C@H:32]([C:79]([O:78][CH2:77][C:61]1[CH:62]=[CH:63][CH:64]=[CH:65][CH:66]=1)=[O:80])[CH2:40][N:41]([C:15](=[O:17])[C:14]1[CH:13]=[CH:12][C:11]([O:10][CH2:9][CH2:8][NH:7][C:2]2[N:1]=[CH:6][CH:5]=[CH:4][N:3]=2)=[CH:19][CH:18]=1)[NH2:43])([CH3:37])([CH3:38])[CH3:39]To a stirred solution of 19-6 (400 mg, 1.5 mmol), 25-a (538, 1.6 mmol), DMF (10 mL), and NMM (6.27 mg, 6.0 mmol) at ambient temperature was added BOP reagent (717 mg, 1.6 mmol). After 24 h, the reaction mixture was diluted with EtOAc and then washed with H2O and brine, dried (MgSO4) and concentrated. Flash chromatograpy (silica, 60% EtOAc/hexanes) gave 25-1 as a yellow oil. TLC Rf 0.14 (silica, 60% EtOAc/hexanes);
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