[F:1][C:2]([F:19])([F:18])[C:3]([NH:5][CH:6]([CH3:17])[CH2:7][C:8]1[CH:13]=[C:12]([O:14][CH3:15])[CH:11]=[CH:10][C:9]=1[I:16])=[O:4].C([O-])([O-])=O.[K+].[K+].[OH-].[K+].[CH2:28](Br)[CH:29]=[CH2:30].Cl>C1(C)C=CC=CC=1.[N+](CCCC)(CCCC)(CCCC)CCCC.[Br-]>[CH2:30]([N:5]([CH:6]([CH3:17])[CH2:7][C:8]1[CH:13]=[C:12]([O:14][CH3:15])[CH:11]=[CH:10][C:9]=1[I:16])[C:3](=[O:4])[C:2]([F:1])([F:18])[F:19])[CH:29]=[CH2:28]A solution of N-trifluoroacetyl-1-(2-iodo-5-methoxyphenyl)-2-propylamine (6.09 g, 15.7 mmol) in toluene (450 mL) was treated with K2CO3 (2.82 g, 20.4 mmol), KOH (2.45 g, 47.1 mmol), n-Bu4NBr (0.506 g, 1.57 mmol) and allyl bromide (2.47 g, 20.4 mmol), and stirred overnight at 80 C. The product mixture was acidified with 10% aqueous HCl, separated, the aqueous phase extracted with ether (500 mL), the combined organic phases were washed with brine (200 mL), dried with Na2SO4 and concentrated to give 4.45 g of a brown oil.
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