Total Syntheses of (±)-(Z)- and (±)-(E)-9-(Bromomethylene)-1,5,5-trimethylspiro[5.5]undeca-1,7-dien-3-one and (±)-Majusculone
作者:Jia-Liang Zhu、Po-Wei Huang、Ruei-Yi You、Fa-Yan Lee、Sheng-Wei Tsao、I-Chia Chen
DOI:10.1055/s-0030-1258412
日期:2011.3
A new total synthesis of the chamigrene sesquiterpenoids (Z)-9-(bromomethylene)-1,5,5-trimethylspiro[5.5]undeca-1,7-diene-3-one and its 15-E-epimer has been accomplished in 13 steps. In our sequence, a Diels-Alder reaction and subsequent reductive alkylation of the resulting adduct was utilized as the key strategy to create the A-ring and the quaternary spirocenter with the suitable functionalities
香米草倍半萜类化合物(Z)-9-(溴亚甲基)-1,5,5-三甲基螺[5.5] undeca-1,7-二烯-3-酮及其15- E表基的新的全合成已于2007年完成。 13个步骤。在我们的序列中,Diels-Alder反应和随后的加合物还原烷基化被用作关键策略,以创建具有合适功能性的A环和季螺中心,以接近B环。此外,还可以通过两步轻松地从高级中间体完全合成去甲香豆素天然产物(±)-大丁烯酮。 变体-倍半萜-大枣-总合成-Diels-Alder反应