Cl.[O:2]1[C:10]2[CH2:9][CH2:8][NH:7][CH2:6][C:5]=2[CH:4]=[CH:3]1.[C:11]1(/[CH:20]=[CH:21]/[C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)[CH:16]=[CH:15][C:14]([C:17](O)=[O:18])=[CH:13][CH:12]=1.C(N(CC)CC)C.C(P(=O)(OCC)OCC)#N>ClCCl.O>[C:11]1(/[CH:20]=[CH:21]/[C:22]2[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=2)[CH:12]=[CH:13][C:14]([C:17]([N:7]2[CH2:8][CH2:9][C:10]3[O:2][CH:3]=[CH:4][C:5]=3[CH2:6]2)=[O:18])=[CH:15][CH:16]=1
To a solution of 0.160 g (1.000 mmol) of 4,5,6,7-tetrahydrofuro[3,2-c]pyridine hydrochloride, 0.269 g (1.2 mmol) of (E)-4-stilbenecarboxylic acid and 0.55 ml (4.0 mmol) of triethylamine in 30 ml of dichloromethane, 0.24 g (1.5 mmol) of diethyl cyanophosphonate was added dropwise under ice-cooling, followed by overnight stirring at room temperature. The reaction mixture was poured into water and extracted with dichloromethane 2 times. The combined organic layer was washed with water and dried over anhydrous sodium sulfate; the solvent was distilled off under reduced pressure. The resulting crude product was recrystallized from hexane-methanol to yield the desired product.
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