Abietane-type Diterpenoids from the Fruit of Vitex rotundifolia L. fil.

Atsushi SAKURAI*, Yasuhisa OKAMOTO, Susumu KOKUBO and Atsushi CHIDA

Department of Chemistry, Faculty of Science, Shizuoka University;
Ohya, Shizuoka-shi 422-8529 Japan

Two new diterpenes 1 and 2 were isolated from the fruit of Vitex rotundifolia L. fil. These compounds were determined as abieta-9(11), 12-diene and abietane 9(11): 12(13)-di-α-epoxide, respectively. Structural determination of 1 was made by the connection of spectroscopic data and the results that 1 afforded known ar-abietatriene (3) by air oxidation. That of 2 was also made by the comparison of spectroscopic data of the MCPBA oxidation products 2, 4, and 5 of 1 and by the analysis of the epoxide ring opening reaction product of 4.

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