[CH2:1]([N:3]([CH2:37][CH3:38])[CH2:4][CH2:5][CH2:6][NH:7][C:8]1[N:9]=[C:10]([C:27]2[CH:28]=[C:29]([CH:33]=[CH:34][C:35]=2[CH3:36])[C:30]([OH:32])=O)[C:11]2[CH:17]=[CH:16][C:15](=[O:18])[N:14]([C:19]3[C:24]([F:25])=[CH:23][CH:22]=[CH:21][C:20]=3[F:26])[C:12]=2[N:13]=1)[CH3:2].CN(C(O[N:47]1N=N[C:49]2[CH:50]=CC=C[C:48]1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F.C(N)CC>C1COCC1>[CH2:1]([N:3]([CH2:37][CH3:38])[CH2:4][CH2:5][CH2:6][NH:7][C:8]1[N:9]=[C:10]([C:27]2[CH:28]=[C:29]([CH:33]=[CH:34][C:35]=2[CH3:36])[C:30]([NH:47][CH2:48][CH2:49][CH3:50])=[O:32])[C:11]2[CH:17]=[CH:16][C:15](=[O:18])[N:14]([C:19]3[C:24]([F:25])=[CH:23][CH:22]=[CH:21][C:20]=3[F:26])[C:12]=2[N:13]=1)[CH3:2]To the compound 3-[2-{[3-(diethylamino)propyl]amino}-8-(2,6-difluorophenyl)-7-oxo-7,8-dihydropyrido[2,3-d]pyrimidin-4-yl]-4-methylbenzoic acid (40 mg, 0.074 mmol) in THF (2 mL) were added HBTU (30 mg, 0.079 mmol) and propylamine (0.031 mL, 0.37 mmol). The mixture was stirred at rt overnight. Solvent was removed by rotovap. Separation by HPLC with TFA, followed by neutralization with SPE amine cartridge afforded the title compound (16 mg, 37%). LC-MS m/z 563 (M+H)+.
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