Alkaloids of Root-bark of Orixa japonica THUNB. XII. Nuclear Magnetic Resonance Study of N-Methylorixidinine, N-Methylisoorixidinine, and N-Methylorixidine.

Abstract

The structures of N-methylorixidinine, N-methylisoorixidinine and N-methylorixidine have been verified by NMR analysis. In addition, the conformation of the substituents on dihydrofuran ring was discussed, based on the relationship between the dihedral angle and the spin coupling constant.