
TY  - JOUR
A1  - Crowley, HC 
A1  - Culvenor, CCJ 
T1  - The Alkaloids of <I>Heliotropium supinum</I> L., with Observations on Viridifloric Acid
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1959
VL  - 12
IS  - 4
SP  - 694
EP  - 705
KW  - 
UR  - https://doi.org/10.1071/CH9590694 
N2  - Heliotropium supinum L. contains the pyrrolizidine alkaloids supinine, heliosupine, and echinatine as major bases. Two minor alkaloids, although not obtained in a pure state, are shown to be esters of trachelanthic acid and viridifloric acid, respectively, with 7-angelylheliotridine. The N-oxide of 7-angelylheliotridine, also isolated from the total crude base, is thought to be an artefact.Viridifloric acid is shown to be (-)-erythro-2,3-dihydroxy-4-methylpentane-3-carboxylic acid. Its melting point is markedly influenced by minute amounts of tenacious impurities. The ester of supinidine and viridifloric acid has been prepared from these component substances. 
ER  -

