[Br:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][CH:9]=1)[CH:5]=O.[C:10]([OH:16])(=[O:15])[CH2:11]C(O)=O.C([O-])(=O)C.[NH4+:21]>C(O)C>[NH2:21][CH:5]([C:4]1[CH:7]=[CH:8][CH:9]=[C:2]([Br:1])[CH:3]=1)[CH2:11][C:10]([OH:16])=[O:15]Step Z (1). A mixture of 200 grams (1.08 mol) of 3-bromobenzaldehyde, 112 grams (1.08 mol) of malonic acid, and 166.5 g (2.16 mol) of ammonium acetate was suspended in 1.125 liters of absolute ethanol. The mixture was mechanically stirred and brought to reflux temperature, whereupon the solution clarified. The mixture was kept at reflux for 16 h, and a precipitate formed. The mixture was chilled to 0° C., and the solid product was collected by filtration and washed with cold ethanol to yield 184 grams (70%) of 3-amino-3-(3-bromophenyl)propanoic acid as a white solid which was carried forward without further purification or analytical characterization.
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