
%0 Journal Article
%A Hart, N 
%A Johns, S 
%A Lamberton, J 
%A Suares, H 
%A Willing, R 
%T New Alkaloids of the <I>ent</I>-Kaurene Type From <I>Anopterus</I> Species. II. The Structure of the Minor Alkaloids
%J Australian Journal of Chemistry
%D 1976/06/01
%V 29
%N 6
%P 1319-1327
%K 
%R https://doi.org/10.1071/CH9761319
%U https://www.publish.csiro.au/paper/CH9761319 
%X Anopterimine (2) is a new diterpenoid alkaloid, and on the basis of spectroscopic data it is considered to have the same carbon skeleton as anopterine. It is remarkable in having a C19-N azomethine system, while another minor base of A. macleayanus is anopterimine N-oxide (3). Two other new alkaloids, hydroxyanopterine and dihydroxyanopterine, both resemble anopterine, and spectroscopic data indicate that they have an additional hydroxy group at C1 or C3 on the A ring. Dihydroxy- anopterine has tiglic acid and the new acid, (E)-4-hydroxy-2-methylbut-2-enoic acid, as esterifying acids. A biosynthetic route to the Anopterus alkaloids is suggested. 
