Asymmetric Total Synthesis of (–)-trans-Blechnic Acid via Rhodium(II)-Catalyzed C–H Insertion and Palladium(II)-Catalyzed C–H Olefination Reactions
作者:Shunichi Hashimoto、Motoki Ito、Ryosuke Namie、Janagiraman Krishnamurthi、Hitomi Miyamae、Koji Takeda、Hisanori Nambu
DOI:10.1055/s-0033-1340291
日期:——
An asymmetric total synthesis of (–)-trans-blechnic acid, a dihydrobenzofuran neolignan, has been achieved. The key steps involve an elaboration of the cis-2,3-dihydrobenzofuran core structure by enantio- and diastereoselective intramolecular C–H insertion using dirhodium(II) tetrakis[N-phthaloyl-(R)-tert-leucinate] [Rh2(R-PTTL)4] and a direct coupling of an acrylate unit with the core structure employing
(-)-trans-blechnic acid,一种二氢苯并呋喃新木脂素的不对称全合成已经实现。关键步骤包括使用四[N-邻苯二甲酰基-(R)-叔亮氨酸][Rh2(R)二铑(II),通过对映选择性和非对映选择性分子内C-H插入来阐述cis-2,3-二氢苯并呋喃核心结构。 -PTTL)4] 和丙烯酸酯单元与核心结构的直接偶联,采用 Yu 的钯 (II) 催化的分子间 C-H 烯化。