A myrtenylfuroheliangolide from Calea rupicola

Cytotoxic and NF-κB inhibitory sesquiterpene lactones from Piptocoma rufescens

“…4 In turn, separation of the chloroform-soluble extract of this plant part yielded four active fractions. Purification of the first fraction gave a new compound, rufesolide C ( 5 ), and five known compounds, 15-deoxygoyazensolide ( 10 ), 4 2',3'-dihydro-15-deoxygoyazensolide ( 11 ), 5 lychnopholide ( 12 ), 6 4,5-dihydrolychnopholide ( 13 ), 7 and eremantholide C. 8 Separation of the second fraction produced three new compounds, rufescenolides A and B ( 1 and 2 ) and rufesolide D ( 6 ), and a known compound, 5-epiisogoyazensolide ( 9 ). 9 Work up of the third fraction afforded three known compounds, goyazensolide ( 8 ), 10 [3-(3,5-dimethoxy-4-hydroxyphenyl)]-1-propanol- trans -coumarate, 3 and 4'-methoxy-5,7,3'-trihydroxyflavone.…”

The pseudoguaianolide peruvin

“…The title ambrosanolide-class sesquiterpene lactone, (I), has been isolated from several species of Ambrosia (Compositae), including A. peruviana (Joseph-Nathan & Romo, 1966), A. conferti¯ora (Yoshioka et al, 1970), A. tenuifolia (Oberti et al, 1986;Schmeda Hirshmann et al, 1986), A. cumanensis (Del Amo & Anaya, 1978), and A. artemisiifolia (hog-weed; Porter & Mabry, 1969;Rybalko et al, 1979;Watanabe et al, 1981). It has been shown to have allelopathic activity, stimulating the germination of witchweed (Fischer et al, 1990), and inhibiting germination of lettuce and growth of rice seedlings (Watanabe et al, 1981).…”

Monoterpenoids

“…The novel myrtenylfuroheliangolide (489) has been found in the aerial parts of Calea rupicola . 409 R dl It was noted that Amaranthus retrojlexus could not grow and complete its normal life-cycle under the sour orange tree (Citrus ~u r a n t i u m ) , ~~~ and it has now been shown411 that a-pinene (485), P-pinene (490), limonene (1 lo), and citronellal, each of which is present in the leaf oil from C. aurantium, are allelopathic to A . retrojlexus.…”