W. Rahman

Biflavones from the leaves of Araucaria bidwillii Hooker and Agathis alba foxworthy (araucariaceae)

Abstract Six biflavones have been isolated from the leaf extracts of Araucaria bidwillii Hooker and Agathis alba Foxworthy; 7-O-methylcupressuflavone (2a) and 7,7″-di-O-methylagathisflavone (1c) are new compounds. The others are 7-O-methylagathisflavone (1a), 4‴,7-di-O-methylagathisflavone (1b), 7,7″-di-O-methylcupressuflavone (2b) and bilobetin (3). In addition, the presence of several other biflavones has been indicated by TLC examination (Table 3).

Biflavones in Selaginella species

Abstract Amentoflavone, hinokiflavone and isocryptomerin have been isolated from Selaginella tamariscina (Beauv.) Spring and two other Selaginella species were shown to contain biflavones.

Prunin-6″-O-p-coumarate, a new acylated flavanone glycoside from Anacardium occidentale

Schabort, J. C., Potgieter, D. J. J. and De Vdliers, V. (1968) Biochim. Biophys. Acta 151, 33. Schabort, J. C. and Potgieter, D. J. J. (1968) Biochim. Biophys. Acta 151, 41. Steyn, D. G. (1950) S. African Med. J. 24. 713. Schabort, J. C. and Teijema, H. L. (1968) Phytochemistry 7, 2107. De Kock, W. T., Enslin, P. R.,Norton, K. B., Barton, D. H. R., Sklarz, B. and Bother-By, A. A. (1963) J. Cllem. Sot. 3828. Enslin, P. R., Hugo, J. M., Norton, K. B. and Revltt, D. E. A. (1960) J. Chem. Sot. 4179. Enslin, P. R. and Norton, K. B. (1964) J. Chem. Sot. 529. Van der Merwe, K. J., Enslin, P. R. and Pachler, K. (1963) J. Chem. Sot. 4215. Lavie. D. and Glotter, E. (1971) Progr. Chem. Organ. Natural Products 29, 307. 10. Lavie, D., Shvo, Y. Willner, D., Enshn, P. R., Hugo, J. M and Norton, K. B. (1959) Chem. Ind. (Land ) 951. 11. Young,‘R. B., l&y&n, M. J. and‘Swea;. M. I_. (1965) ilrch. Biochem. Biophys. 109,233. 12. Spector, T. and Massey. V. (1972) J. Biol. Chem. 247, 5632. 13. Horecker, B. L and Kornberg, A. (1948) J. Biol. Chem. 175. 385. 14. Schwartz, H. M., Bledron, S. I., Van Holdt. M M. and Rehm, S. (1964) Phytochemistry 3, 189. 15. Schabort, J. C. and Potgieter, D J. J. (1967) J Chromatog. 31, 235 and references therein. 16. Lowry, 0. H.. Rosebrough, N. J.. Farr, A. I_. and Randall, R. J. (1951) J. Biol. Chem. 193, 265. 17. McKenzie, H. A. and Wallace, H. S. (1954) Australran J. Chem. 7. 55.

Biflavanoids and a flavanone-chromone from the leaves of Garcinia dulcis(Roxb.) Kurz

From the leaves of Garcinia dulcis(Roxb) Kurz a series of biflavanoids were isolated. Morelloflavone was characterised as its heptamethyl ether; it forms an octa-acetate by ring opening of ring I-C. GB-2a forms an octamethyl ether having a naringenin unit linked to a chalcone. By methylation, volkensiflavone and amentoflavone were isolated (as their hexamethyl ethers); methylation of a minor component gave the novel I-4′,I-5,II-5,I-7,II-7-pentamethoxyflavanone[I-3,II-8]chromone.

Moluccanin, a coumarinolignoid from Aleurites moluccana

Abstract A new coumarinolignoid has been isolated from stem chips of Aleurrites moluccana and its structure determined on the basis of chemical and spectros

Robustaflavone—the first member of a new series of biflavones

Isolierung und Strukturaufklärung eines neuen Typs der Biflavone ausAgathis robusta.

Biflavonyls of the araucariales

Abstract TLC examination of complex mixtures of biflavonyls from the leaf extracts of Araucaria bidwilli A. cookii, A. cunninghamii, Agathis alba and A. palmerstoni has been carried out. Chromatographically homogeneous mixtures of natural biflavonyls including minor components have been identified after complete methylation. Attention is drawn to aspects of chemotaxonomical significance.

New C-glycosylflavones from Phlox drummondii

Abstract O -Rhamnosyl-6- C -Xylosyl derivatives of apigenin and luteolin were found to be the two major flavonoids of the flowers of Phlox drummondii .

Ochnaflavone and its derivatives: a new series of diflavonyl ethers from Ochna squarrosa Linn

Ochnaflavone (4′,5,5″,7,7″-pentahydroxy-3′,4‴-oxydiflavone)(3) and its methyl ethers [(12) and (13)] isolated from the leaves of Ochna squarrosa Linn. (Ochnaceae), were identified from their spectral data and by synthesis of penta-O-methylochnaflavone (1). They are diflavonyl ethers linked via the two phenyl rings.

Taiwaniaflavone and its derivatives: a new series of biflavones from Taiwania cryptomerioides Hayata

Taiwaniaflavone (3,3′-linked biapigenin)(1) and its methyl ethers [(2) and (3)] isolated from the leaves of Taiwania cryptomerioides Hayata (Taxodiaceae) have been identified on the basis of spectral data and by synthesis of taiwaniaflavone methyl ethers [(5) and (29)]. Five known biflavones [(7), (8), (9), (10), and (11)] have also been isolated from the same plant.