[Cl:1][C:2]1[CH:7]=[C:6]([C:8]#[CH:9])[CH:5]=[C:4]([Cl:10])[CH:3]=1.[CH2:11]([O:13][C:14](=[O:18])/[CH:15]=[CH:16]/I)[CH3:12].O>C(N(CC)CC)C.Cl[Pd](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[Cu]I>[CH2:11]([O:13][C:14](=[O:18])/[CH:15]=[CH:16]/[C:9]#[C:8][C:6]1[CH:7]=[C:2]([Cl:1])[CH:3]=[C:4]([Cl:10])[CH:5]=1)[CH3:12]
To a solution of 1,3-dichloro-5-ethynyl-benzene (1.52 g, 8.9 mmol) in triethylamine (32.4 mL) was added PdCl2(PPh3)2 (57.15 mg, 0.08 mmol), (E)-3-iodo-prop-2-enoic-acid ethyl ester (1.84 g, 8.1 mmol) and copper(I)iodide (7.7 mg, 0.04 mmol). The reaction mixture was stirred for 2 h at 50° C., whereafter the reaction mixture was cooled to room temperature, water (30 mL) added and the mixture extracted with diethyl ether (3×20 mL). The combined and dried organic phases were evaporated to give crude (E)-5-(3,5-dichlorophenyl)-pent-2-en-4-ynoic acid ethyl ester in 1.1 g yield.
Wird geladen…
