Syneilesis palmata

A full paper on the constituents of Syneilesis palmata Maxim, has appeared.32 As well as syneilesine (53), a new alkaloid, viz. acetylsyneilesine (54), and sene-cionine have been extracted from this plant. The structure of this new alkaloid (54) was proved by acetylation of syneilesine with acetic anhydride and sodium acetate. The remaining doubt in the structure of syneilesine (53) is associated with the... 

Syneilesine (12) from Syneilesis palmata (family Compositae) is an ester of otonecine with a new Cw necic acid belonging to the senecic acid biogenetic class. The diester nature of the alkaloid was revealed by i.r. maxima at 1735 and 1720 cm and by signals in the Cn.m.r. spectrum at 171.4 and 176.7 p.p.m. Alkaline hydrolysis gave three lactones designated as syneilesinolides-A (13), B... 

Hikichi, M., and T. Furuya Syneilesine, a New Pyrrolizidine Alkaloid from Syneilesis palmata. Tetrahedron Lett. 1974, 3657. 

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