Synthesis for turning synephrenine into N-methylphenethylamine
Suggested route - step 1 acetylate the amine with 1 eq of acetyl chloride in pyridine.

step 2 hydrogenation of the benzylic alcohol over Pd/C in the presence of acid or use TFA/triethylsilane

step 3 form the triflate of the phenol

step 4 catalytic transfer hydrogenation of the triflate, conditions here

Step 5 acid hydrolysis of the N-acetyl group with cHCl to give product

Thanks to @PCK for the suggestion of forming and reducing the triflate