[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH:12](Br)[CH3:13])=[C:6]([CH:11]=1)[C:7]([O:9]C)=O.[CH3:15][O:16][C:17]1[CH:22]=[CH:21][C:20]([C@H:23]([NH2:25])[CH3:24])=[CH:19][CH:18]=1.C(N(CC)CC)C>CO>[Br:1][C:2]1[CH:11]=[C:6]2[C:5]([CH:12]([CH3:13])[N:25]([C@@H:23]([C:20]3[CH:21]=[CH:22][C:17]([O:16][CH3:15])=[CH:18][CH:19]=3)[CH3:24])[C:7]2=[O:9])=[CH:4][CH:3]=1Add solid methyl 5-bromo-2-(1-bromoethyl)benzoate (1724 g, 5.35 mol) to a solution of commercially available (R)-1-(4-methoxyphenyl)ethanamine (BePharm, WZG111219-071; 974 g, 6.44 mol) and triethylamine (1710 mL, 12.26 mol) in methanol (12 L). Heat the mixture for 10 hours at 67° C. then evaporate to dryness under reduced pressure. Partition the residue with ethyl acetate (5 L) and aqueous 1 N HCl (10 L), separate the phases, wash the organic phase again with aqueous 1 N HCl (5 L), saturated sodium bicarbonate, saturated aqueous sodium chloride, then dry over sodium sulfate, filter, and evaporate under reduced pressure. Dissolve the dark red oil in methyl-tert-butyl ether (750 mL) and add petroleum ether (3 L) with vigorous stirring. Filter the solids, wash with methyl-tert-butyl ether/petroleum ether (1:8), petroleum ether, dry in open air to give the title compound as an off-white solid (1014 g, 52%). ES/MS m/z: 360 (M+H).
Loading…
