THE ALKALOIDS OF FUMARIACEOUS PLANTS: XXV. CORYDALIS PALLIDA PERS.

Abstract

In addition to corypalline, the isolation of which has already been recorded, Corydalis pallida Pers. has yielded five known and two new alkaloids. The known bases are,—protopine, d- and dl-tetrahydro-palmatine, capaurine, and capauridine. The new alkaloids are capaurimine (F50), C20H23O5N (phenolic; two hydroxyl and three methoxyl groups), and alkaloid F51, C20H23O4N (one hydroxyl and three methoxyl groups). Capaurimine on methylation yields capaurine O-methyl ether, the dl- form of which is identical with capauridine O-methyl ether. Alkaloid F51 on methylation yields dl-tetrahydro-palmatine but it is not identical with the known dl-bases of the same formula.