作者:Sadao Tsuboi、Jun-ichi Sakamoto、Akihisa Kuroda、Masanori Utaka、Akira Takeda
DOI:10.1246/bcsj.61.1410
日期:1988.4
The treatment of (2E,4Z)-2,4-alkadienoic esters with lithium diisopropylamide (LDA) at −80 °C gave (3E,5E)-isomers with 81–98% stereoselectivity. In contrast, the treatment of (2E,4E)-isomers under the same conditions gave (3E,5Z)-isomers with 72–80% stereoselectivity. The application to the synthesis of megatomoic acid is described. Carbon-13 NMR data regarding these 3,5-dienoates were obtained.
(2E,4Z)-2,4-alkadienoic esters 在 -80 °C 下用二异丙基酰胺锂 (LDA) 处理后,可得到 (3E,5E)-异构体,立体选择性为 81-98%。相反,在相同条件下处理 (2E,4E)-异构体,得到的 (3E,5Z)-异构体的立体选择性为 72-80%。介绍了在合成巨豆酸中的应用。还获得了有关这些 3,5-二烯酸盐的碳-13 NMR 数据。