✍ Scribed by Bernard Kaptein; Vania Monaco; Quirinus B. Broxterman; Hans E. Schoemaker; Johan Kamphuis
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L‐α‐Methylphenylalanine, obtained by enzymatic resolution of the corresponding racemic amide with amidase from Ochrobactrum anthropi NCIMB 40321, was used in the synthesis of dipeptides containing α‐substituted amino acids. The 2‐hydroxynaphthalene‐1‐carboxaldehyde Schiff bases of the dipeptides (1 and 2) were tested as Ti(IV) and Al(III) complexes in asymmetric Lewis‐acid‐catalyzed reactions. Only the Al(III) complex of 2 showed moderate enantioselectivity in the cyanation reaction of benzaldehyde with TMS‐CN.
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Table 2. Selected spectroscopic data of 7a-d, 8, and 9 [a].
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