Abstract
Two new pyrrolizidine
alkaloids, cynaustraline and cynaustine, have been isolated from Cynoglossum australe R,.Br., and echinatine and a third new
alkaloid, amabiline, from C. amabile Stapf & Drummond. Cynaustraline, cynaustine, and
amabiline are, respectively, (+)- isoretronecanol,
(+)-supinidine, and (-)-supinidine esters of viridifloric acid. This is the
first isolation of an ester of a (+)- enantiomer of an allylic amino alcohol.
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