[F:1][C:2]([F:13])([F:12])[CH:3]([C:8]([F:11])([F:10])[F:9])[CH2:4][C:5](O)=[O:6].CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F.C(N(CC)C(C)C)(C)C.[C:45]([C:49]1[CH:56]=[CH:55][C:52]([CH2:53][NH2:54])=[CH:51][CH:50]=1)([CH3:48])([CH3:47])[CH3:46]>CN(C=O)C.O>[C:45]([C:49]1[CH:50]=[CH:51][C:52]([CH2:53][NH:54][C:5](=[O:6])[CH2:4][CH:3]([C:8]([F:11])([F:10])[F:9])[C:2]([F:13])([F:12])[F:1])=[CH:55][CH:56]=1)([CH3:48])([CH3:46])[CH3:47]A solution of 2.1 g of 4,4,4-trifluoro-3-trifluoromethyl-butyric acid (10 mmol) in 80 ml DMF was treated with 3.12 g of TBTU (10 mmol) and 8.55 ml of N,N-diisopropylethyl amine and stirred for 5 min at rt under argon. Then 1.93 ml of 4-tert-butylbenzylamine (11 mmol) were added and the reaction mixture was stirred 17 h at rt. The reaction mixture was then diluted with 400 ml water and extracted twice with EtOAc, the combined organic phases washed with brine, dried over magnesium sulfate filtered and concentrated in vacuo. The residue was purified by column chromatography (40 g silica gel; heptane/EtOAc 4:1) to give 2.14 g of N-(4-tert-butyl-benzyl)-4,4,4-trifluoro-3-trifluoromethyl-butyramide as a light yellow solid (60%).
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