[CH3:1][C:2]([CH3:30])([CH3:29])[C:3](=[O:28])[CH2:4][O:5][C:6]1[CH:11]=[CH:10][C:9]([C:12]([C:17]2[S:21][C:20]([S:22]([NH2:25])(=[O:24])=[O:23])=[C:19]([CH3:26])[CH:18]=2)([CH2:15][CH3:16])[CH2:13][CH3:14])=[CH:8][C:7]=1[CH3:27].CCN=C=NCCCN(C)C.[C:42](O)(=[O:45])[CH2:43][CH3:44]>CN(C1C=CN=CC=1)C.ClCCl>[C:42]([NH:25][S:22]([C:20]1[S:21][C:17]([C:12]([C:9]2[CH:10]=[CH:11][C:6]([O:5][CH2:4][C:3](=[O:28])[C:2]([CH3:1])([CH3:29])[CH3:30])=[C:7]([CH3:27])[CH:8]=2)([CH2:13][CH3:14])[CH2:15][CH3:16])=[CH:18][C:19]=1[CH3:26])(=[O:24])=[O:23])(=[O:45])[CH2:43][CH3:44]A mixture of 5-{1-[4-(3,3-dimethyl-2-oxo-butoxy)-3-methyl-phenyl]-1-ethyl-propyl}-3-methyl-thiophene-2-sulfonic acid amide (330 mg, 0.73 mmol), EDCI (210 mg, 1.1 mmol), propionic acid (82 μL, 1.1 mmol) and DMAP (50 mg) in dichloromethane (10 ml) is stirrred overnight. The reaction is diluted with dichloromethane and washed with 1N HCl. The organic phase is concentrated and chromatographed (Hex to 30% EtOAc/Hex) to give the title compound (92%).
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