Constituents of Clausena excavata. Isolation and structural elucidation of new carbazole alkaloids

Abstract

Constituents of the roots, the stem bark, and the leaves of Clausena excavata BURM. f. (Rutaceae) grown in a greenhouse at Okitsu Branch, Fruit Tree Research Station, Shizuoka, were studied. New carbazole alkaloids named clauszoline-H (1), -I (2), and -J (4) from the roots, clauszoline-K (6) and - L (7) from the stem bark, and clauszoline-M (8) from the leaves were isolated, together with known carbazoles and coumarins, and their structures were elucidated by spectroscopic methods.