[CH3:1][O:2][C:3]1[CH:4]=[C:5]([CH2:11][CH2:12][NH2:13])[CH:6]=[C:7]([O:9][CH3:10])[CH:8]=1.[F:14][C:15]1[CH:20]=[CH:19][C:18]([CH2:21][C:22](O)=[O:23])=[CH:17][CH:16]=1.C1CN([P+](ON2N=NC3C=CC=CC2=3)(N2CCCC2)N2CCCC2)CC1.F[P-](F)(F)(F)(F)F.C(N(C(C)C)C(C)C)C>CN(C=O)C.O>[CH3:10][O:9][C:7]1[CH:6]=[C:5]([CH2:11][CH2:12][NH:13][C:22](=[O:23])[CH2:21][C:18]2[CH:19]=[CH:20][C:15]([F:14])=[CH:16][CH:17]=2)[CH:4]=[C:3]([O:2][CH3:1])[CH:8]=1To a solution of 2-(3,5-dimethoxy-phenyl)-ethylamine (1.01 g, 5.57 mmol) in anhydrous DMF (50 mL) is added 4-fluorophenyl acetic acid (860 mg, 5.57 mmol), PyBOP (3.17 g) and N-ethyldiisopropylamine (2.2 mL, 12.8 mmol). The mixture is stirred at rt for 14 h. Water (60 mL) is added, and the mixture is extracted with EtOAc (4×60 mL). The combined organic phases are washed with brine, dried over MgSO4, filtered and concentrated in vacuo. The residue is purified by silica gel column chromatography (EtOAc/Hex, 7:3) to afford the title compound as a yellow oil.
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