Abstract
Five new tetranortriterpenoids, (11β)-21,23-dihydro-11,21-dihydroxy-23-oxoobacunone (=21,23-dihydro-21-hydroxy-23-oxozapoterin; 2), (11β)-21,23-dihydro-11,23-dihydroxy-21-oxoobacunone (=21,23-dihydro-23-hydroxy-21-oxozapoterin; 3), (1α,11β)-1,2,21,23-tetrahydro-1,11,23-trihydroxy-21-oxoobacunone (=21,23-dihydro-23-hydroxy-21-oxoclausenarin; 4), (1α,11β)-23-ethoxy-1,2,21,23-tetrahydro-1,11-dihydroxy-21-oxoobacunone (=23-ethoxy-21,23-dihydro-21-oxoclausenarin; 5); (11β)-1,2,21,23-tetrahydro-11,23-dihydroxy-21-oxoobacunoic acid; 6), were isolated from the aerial part of Clausena excavata Burm. f. (Rutaceae). All compounds possessed 3,4-seco skeletons. Their structures were established by spectroscopic studies. Tetranortriterpenoids with a 4-hydroxybut-2-eno-4-lactone moiety are rarely found in the genus Clausena.
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