Syringaldehyde is alkylated with propyl iodide to 3,5-dimethoxy-4-propoxybenzaldehyde, the benzaldehyde is reacted with a chloroacetic acid ester in a Darzens condensation to give (3,5-dimethoxy-4-propoxyphenyl)acetaldehyde. This acetaldehyde can be reductively aminated with ammonia and Raney nickel, or the aldoxime formed with hydroxylamine which is then reduced to the amine proscaline (3,5-dimethoxy-4-propoxyphenethylamine). All reagents here are pretty unwatched.