[C:1]([NH:4][C:5](=[CH:9][C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[C:12]([OH:17])[CH:11]=1)[C:6]([OH:8])=[O:7])(=[O:3])[CH3:2].[H][H]>>[C:1]([NH:4][C@H:5]([C:6]([OH:8])=[O:7])[CH2:9][C:10]1[CH:15]=[CH:14][C:13]([OH:16])=[C:12]([OH:17])[CH:11]=1)(=[O:3])[CH3:2]reacting α-acetamido-3,4-dihydroxycinnamic acid with hydrogen in the presence of a catalytic amount of a chiral hyrogenation catalyst of the formula ##STR36## to produce N-acetyl-3,4-dihydroxy-L-phenylalanine; and (b) hydrolyzing the N-acetyl-3,4-dihydroxy-L-phenylalanine to produce 3,4-dihydroxy-L-phenylalanine.
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