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■ Two New Diterpenoid Alkaloids from Delphinium pacific giant and Revised ¹³C-Nmr Assignment of Delpheline

Hideo Bando, Koji Wada, Junko Tanaka, Sachie Kimura, Ekumi Hasegawa, and Takashi Amiya

*Hokkaido College of Pharmacy, 7-1 Katsuraoka-cho, Otaru 047-02, Japan

Abstract

Two new C₁₉-diterpenoid alkaloids, paciline (1) and pacinine (2), and a known alkaloid, delpheline (1) were isolated from Delphinium pacific giant. Structures of those alkaloids were determined on the basis of their spectral data and chemical correlation with delpheline (3). Paciline (1) was afforded by methylation of delpheline (3) and pacinine (2) was afforded by oxidation of delpheline (3). ¹³C-Chemical shifts assigned to C-1, C-9, C-10, C-14, and C-16 of delpheline (3) were revised on the basis of 2D nmr measurement.