Alkaloids of Corydalis incisa PERS. VI. The Structures of Benzo [c] phenanthridine-type Alkaloids, 12-Hydroxycorynoline and 11-Epicorynoline

Abstract

New minor benzo [c] phenanthridine-type alkaloids, 12-hydroxycorynoline (I), C₂₁H₂₁O₆N, mp 245-246.5°, [α] D 0°, and 11-epicorynoline (IX), C₂₁H₂₁O₅N, mp 195.5-196.5°, [α] D 0°, along with 6-oxocorynoline (X), were isolated from Corydalis incisa PERS. (Papaveraceae). These structures were established by the spectroscopic studies and chemical correlations with the derivatives of corynoline.