Metazocine
[6][7] Metazocine is in Schedule II of the Controlled Substances Act 1970 of the United States as a Narcotic with ACSCN 9240 with a 19 gram aggregate manufacturing quota as of 2014.The free base conversion ratio for salts includes 0.81 for the hydrochloride and 0.74 for the hydrobromide.Reaction of the Grignard reagent from p-methoxybenzyl chloride (1) with the lutidine methiodide (2) affords the benzylated dihydropyridine (3).Cyclization by means of acid leads directly to the benzomorphan ring system (5).Although this last compound is in fact a relatively potent analgesic, it is not available commercially as a drug.