[CH3:1][C:2]1[NH:3][C:4]2[C:5](=[O:14])[CH2:6][CH2:7][CH2:8][C:9]=2[C:10]=1[C:11]([OH:13])=O.C1C=CC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.C(N(CC)CC)C.[NH2:43][CH2:44][CH:45]([OH:52])[CH2:46][N:47]([CH2:50][CH3:51])[CH2:48][CH3:49]>CN(C=O)C>[CH2:48]([N:47]([CH2:50][CH3:51])[CH2:46][CH:45]([OH:52])[CH2:44][NH:43][C:11]([C:10]1[C:9]2[CH2:8][CH2:7][CH2:6][C:5](=[O:14])[C:4]=2[NH:3][C:2]=1[CH3:1])=[O:13])[CH3:49]A mixture of 2-methyl-7-oxo-4,5,6,7-tetrahydro-1H-indole-3-carboxylic acid (S4) 0.2 g (1.0 mmol), HOBt 0.16 g (1.2 mmol), EDCI 0.24 g (1.2 mmol) and triethylamine 0.2 g (2.0 mmol) in 10 ml DMF was stirred at room temperature for 20 min, then 1-amino-3-(diethylamino)propan-2-ol 0.31 g (2.1 mmol) was added. After stirred at room temperature for 24 hours, the mixture was poured into the ice water and extracted with CH2Cl2. The organic layer separated was washed with water and saturated sodium chloride solution, then dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was purified by a silica gel column, eluted with CH2Cl2/MeOH (3:1), to give 0.26 g (81%) of the titled compound as a white solid.
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