Synthesis of (E)-2,6-dimethyl-6-hydroxyocta-2,7-dienoic acid and the corresponding amide (“acacialactam”) in optically active form
作者:Miguel Carda、Juan Murga、Florenci González、J Alberto Marco
DOI:10.1016/0040-4020(95)00025-4
日期:1995.2
The total synthesis of the title compounds in opticallyactiveform from geraniol as the starting material is described. The physical and spectral properties of the synthetic amide are identical with those of the natural compound acacialactam, this fact confirming that the structure proposed for the latter compound is not correct. The configuration of the single stereogenic carbon atom in the natural
Concise Total Synthesis of (+)-Lanceolactone A: Revision of Absolute Stereochemistry
作者:Balasaheb R. Borade、Ravindar Kontham
DOI:10.1021/acs.joc.2c01450
日期:2022.10.7
A chiral-pool protecting-group-free five-step total synthesis of tetranorsesquiterpenoide (+)-lanceolactone A and all of its four stereoisomers using (S)-(+)-, and (R)-(−)-linalool (coriandrol) as building blocks is disclosed. The key steps involved in this synthetic route are regioselective ozonolysis, Au(I)-catalyzed cycloisomerization-induced construction of furan from alleneone, and dye-sensitized
使用 ( S )-(+)- 和 ( R )-(-)-芳樟醇 (coriandrol ) 作为构建块被公开。该合成路线涉及的关键步骤是区域选择性臭氧分解、Au(I) 催化的环异构化诱导由丙二烯酮构建呋喃,以及羟烷基束缚呋喃的染料敏化光氧化(通过1 O 2 ;单线态氧)奥螺内酯。在对所有可能的立体异构体的电子圆二色性 (ECD) 和旋光数据进行全面评估后,天然披针内酯 A 在 C4 和 C7 位置的绝对构型已指定为 (+)-(4S ,7 S ),它是最初提出的结构 (+)-(4 R ,7 R ) 的对映异构体。此外,这些调查使我们将 Feringa 和 Gawronski 的 CD 相关方法扩展到 [5,5]- 和 [6,5]-氧杂螺内酯。