The invention discloses a method for preparing a Z-type isomer of
terbinafine hydrochloride. The method uses tert-butyl
acetylene as a starting material, converts it into 3,3-dimethyl-1-butynyl
lithium through a reaction with n-
butyl lithium, synthesizes an intermediate 13-hydroxy-6,6-dimethyl-1-
heptene-4-yne with
acrolein, and then synthesizes an intermediate 2E / Z-1-bromo-6,6-dimethyl-2-
heptene-4-yne through
halogenation; the intermediate 2 is condensed with N-methyl-1-naphthylmethylamine under alkaline conditions to synthesize
terbinafine free base, and then salifies it with
hydrogen chloride and refines it with methyl tert-butyl
ether to obtain a high-purity
terbinafine hydrochloride isomer (Z)-N-(6,6-dimethylheptene-2-en-4-ynyl)-N-methyl-1-naphthylmethylamine. The process
route of the invention is short, the synthesis steps are relatively simple, the raw materials used in the experiment are easily available, the
reaction conditions are relatively mild, the product quality is stable, the whole operation is simple and easy to implement, the prepared sample has high purity, and can be used for the preparation of terbinafine Z-isomer reference substance.