A complete synthesis is reported for the racemic forms of all four possible cis- and trans-B/C-DELTA-5(10),15-rosadienes using electrophilic cyclization of their regular A,B-seco precursors in the final step.
Upon heating in formic acid dolabradiene (1) gives a mixture of hydrocarbons. Five backbonerearrangement products isolated from the mixture are assigned to Δ5(10)-8β-rimuene (2), Δ5(10)-rimuene (3), Δ1(10)-rimuene (4), Δ8(9)-pimaradiene (5), and Δ1(10),5-rimutriene (6a), respectively. Their formation mechanisms are also discussed.
Juvenile-adult chemical dimorphism in foliage of Dacrydium biforme
作者:Alan R. Hayman、Nigel B. Perry、Rex T. Weavers
DOI:10.1016/0031-9422(86)88017-7
日期:1986.1
specimens of Dacrydium biforme adult foliage. The major sesquiterpenes, which vary considerably in level from tree to tree, have been identified. Juvenile and adult foliage extracts from the same trees differed greatly. 8α-Isopimara-9(11),15-diene was the major diterpene in juvenilefoliage. (Z)-5-Ethylidene-2(5H)-furanone was an artefact of steam-distillation of juvenile leaves.
Cyclization and rearrangement of diterpenoids. VII. Composition of the hydrocarbon fraction of a mixture of the products of cyclization of manool and sclareol by ordinary acids
作者:N. D. Ungur、A. N. Barba、P. F. Vlad
DOI:10.1007/bf00633391
日期:——
DRAGAN, VLADIMIR A.;VESELOVSKY, VLADIMIR V.;MOISEENKOV, ALEXANDER M., MENDELEEV COMMUN.,(1991) N, C. 36-37
作者:DRAGAN, VLADIMIR A.、VESELOVSKY, VLADIMIR V.、MOISEENKOV, ALEXANDER M.
DOI:——
日期:——
MOISEENKOV, A. M.;DRAGAN, V. A.;VESELOVSKIJ, V. V.;SHASHKOV, A. S., IZV. AN CCCP. CEP. XIM.,(1991) N, S. 1896-1905
作者:MOISEENKOV, A. M.、DRAGAN, V. A.、VESELOVSKIJ, V. V.、SHASHKOV, A. S.