https://www.thevespiary.org/rhodium/Rhodium/chemistry/amphetamine.resolution.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/amphetamine.resolution.html)
You can also use reductive alkylation using methylbenzylamine as found in:
https://www.thevespiary.org/rhodium/Rhodium/chemistry/reductive.alkylation.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/reductive.alkylation.html)
Reductive Alkylation of alpha-Methylbenzylamine with 1-Phenyl-2-Propanone Followed by Hydrogenolysis:
Nichols et al., Asymmetric Synthesis of Psychotomimetic Phenylisopropylamines, J. Med. Chem. 16(5) (1973) 480-3. This procedure offers a route to dextro-amphetamine from phenyl-2-propanone