Synthesis and Stereochemistry of the Four Himachalene-Type Sesquiterpenes Isolated from the Flea Beetle (Aphthona flava) as Pheromone Candidates
作者:Shin-etsu Muto、Masahiko Bando、Kenji Mori
DOI:10.1002/ejoc.200300812
日期:2004.5
8-tetramethyl-1,2,3,4,5,6,5a-heptahydrobenzo[1,2-a][7]annulene (3), and 1,1,5,8-tetramethyl-1,2,3,4,5-pentahydrobenzo[a][7]annulene (ar-himachalene, 4). The stereochemistry of these himachalene-type sesquiterpenes isolated from flea beetles such as Aphthona flava and Phyllotreta cruciferae as their male-pheromone components was revised to (1S,2R)-1, (6R,7S)-2, (5R,5aS)-3, and (R)-4. (© Wiley-VCH Verlag GmbH
2,6,6-三甲基双环[5.4.0]undec-7-en-9-one (1) 的 (1S,2R) 和 (1R,2S) 异构体均由 (S)- 和 ( R)-香茅醛 (5),分别。(1R,2S)-(-)-1 的立体化学是通过 X 射线分析确定的;它表现出类似于 cholest-4-en-3-one 的 CD 谱,与其绝对构型一致。酮 (1S,2R)- 和 (1R,2S)-1 被转化为其他三种喜马查烯烃的对映异构体,2,2,6-trimethyl-10-methylenebicyclo[5.4.0]undec-1(11)-烯 (2), 1,1,5,8-四甲基-1,2,3,4,5,6,5a-七氢苯并[1,2-a][7] 环烯 (3), 和 1,1, 5,8-四甲基-1,2,3,4,5-pentahydrobenzo[a][7]annulene (ar-himachalene, 4)。这些喜马偕烯型