Sterospecific Syntheses and Spectroscopic Properties of Isomeric 2,4,6,8-Undecatetraenes. New Hydrocarbons from the Marine Brown AlgaGiffordia mitchellae. Part IV.
作者:Wilhelm Boland、Nora Schroer、Christiane Sieler、Martin Feigel
DOI:10.1002/hlca.19870700415
日期:1987.7.8
Giffordene (=(2Z,4Z,6E,8Z)-2,4,6,8-undecatetraene; 9f) and five steroisomers are new C11H16 hydrocarbons from the marine brown alga Giffordia mitchellae. Their synthesis is based on non-stereoselective Wittig reactions of (E)-2-alkenals with appropriate acetylenic phosphoranes and subsequent chromatographic separation of the resulting (E/Z)-pairs. The uniform enynes (>98% purity) are then stereospecifically
Giffordene(=(2 Z,4 Z,6 E,8 Z)-2,4,6,8-十一碳烯; 9f)和5种立体异构体是来自海洋褐藻Giffordia mitchellae的新C 11 H 16烃。它们的合成基于(E)-2-烯烃与适当的炔基膦烷的非立体选择性Wittig反应,以及随后色谱分离所得的(E / Z)对。然后将均匀的炔烃(> 98%的纯度)在水溶液中用Zn(Cu / Ag)立体定向还原为(Z)烯烃。MeOH在室温13 C-和1给出了新四烯的1 H-NMR数据。从生物合成上,giffordene(9f)通过不稳定的(3 Z,5 Z,8 Z)-1,3,5,8,-十一碳六烯衍生自十二碳3,6,9-三烯酸,然后经热允许的对苯二酚1, 7-σ氢转移至(2 Z,4 Z,6 E,8 Z)-异构体9f。