[Br:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]([CH3:12])[C:9]([OH:11])=O)=[CH:4][CH:3]=1.CC[N:15]([CH:19]([CH3:21])[CH3:20])C(C)C.CN(C(ON1N=NC2C=CC=CC1=2)=[N+](C)C)C.[B-](F)(F)(F)F.C1(N)CC1>CN(C=O)C.O>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([CH3:12])[C:9]([NH:15][CH:19]2[CH2:21][CH2:20]2)=[O:11])=[CH:6][CH:7]=1
To a mixture of 18.0 g (79.0 mmol) 2-(4-bromo-phenyl)-propionic acid (Bioorg. Med. Chem. Lett. 2010, 20, 887) and 68.4 mL (393 mmol) DIPEA in 90 mL DMF, 50.5 g (157 mmol) TBTU are added. The mixture is stirred for 15 min at 0° C. After that time, 16.3 mL (236 mmol) cyclopropylamine are added and the mixture is stirred for 16 h at rt. After that time, iced water is added and the mixture is extracted with EtOAc. The organic layer is washed with brine and dried over sodium sulphate. The solvent is evaporated and the residue is purified by column chromatography (silica gel; hexane/EtOAc 7:3) to yield the desired product.
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