A procedure for the preparation of tetrahydroalstonine from vegetable species of the apocinaceas family. (Machine-translation by Google Translate, not legally binding)

摘要

A process for preparing tetrahydroalstonin from plant species of the apocinaceae family, characterized in that the following successive operations are carried out: direct alcoholic or hydroalcoholic extraction of said plant species, concentration of the obtained alcoholic extract, complete reduction of the totality of said concentrated alcoholic extract obtained, elimination by filtration of the raubasin precipitate and treatment of the organic phase to obtain the crude tetrahydroalstonin, treatment of the crude tetrahydroalstonia in organic phase to obtain the tetrahydroalstonin citrate, recovery of the tetrahydroalstonin citrate by means of ethanol of 95º to obtain a pure product. (Machine-translation by Google Translate, not legally binding)