Studies on the alkaloids of formosan Corydalis species. Part VI. Elucidation of the structures of two spirobenzylisoquinoline alkaloids, yenhusomine and yenhusomidine, and two berbine alkaloids, corytenchine and corytenchirine, from Corydalis ochotensis(turcz.)

Abstract

Separation of the basic fraction from Corydalis ochotensis(Turcz.) afforded four new alkaloids [yenhusomine (5), yenhusomidine (9), corytenchine (12), and corytenchirine (21)] together with the known alkaloids, protopine, ochotensimine, and adlumidine. The identification of the new alkaloids is described. Didehydrocheilantifoline was also isolated, from a quaternary base fraction.