[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[CH:3]=[C:2]1/[CH:10]=[CH:11]/[CH:12]=[C:13](\[O:17][CH3:18])/[C:14]([OH:16])=O.[CH2:19]([N:21]([CH2:26][CH3:27])[CH2:22][CH2:23][CH2:24][NH2:25])[CH3:20].O.ON1C2N=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC>CN(C=O)C>[O:1]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[CH:3]=[C:2]1/[CH:10]=[CH:11]/[CH:12]=[C:13](\[O:17][CH3:18])/[C:14]([NH:25][CH2:24][CH2:23][CH2:22][N:21]([CH2:26][CH3:27])[CH2:19][CH3:20])=[O:16]A solution of (2Z,4E)-5-(benzofuran-2-yl)-2-methoxy-2,4-pentadienoic acid (122 mg, 0.5 mmol), 3-diethylaminopropylamine (65 mg, 0.5 mmol), 1-hydroxy-7-azabenzotriazole hydrate (65 mg, 0.5 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (95 mg, 0.5 mmol) in DMF (2 ml) was stirred at RT overnight. After the same work-up described in example 3 the residue was chromatographed on silicagel (preparative TLC, EtOAc/MeOH/aq.NH3 8/2/1). The fraction collected was dried to give pure title compound (32 mg, O90 mmol, yield 18.0%) as pale brown crystals, m.p.=79°.
Loading…