A Concise Catalytic Route to the Marine Sesquiterpenoids (-)-Clavukerin A and (-)-Isoclavukerin A
作者:Stephan Knüppel、Victor O. Rogachev、Peter Metz
DOI:10.1002/ejoc.201001087
日期:2010.11
zed strategy, the enantiopure title hydroazulenes were prepared in only four steps from (S)- and (R)-citronellal, respectively. A catalyst-controlled diastereoselective Michael addition of these aldehydes to methyl vinyl ketone followed by chemoselective dibromoolefination and one-pot Wittig olefination/alkyne formation afforded the key dienynes that underwent regioselective domino metathesis to yield
On the Diastereoselectivity of Intramolecular Pd-Catalyzed TMM Cycloadditions. An Asymmetric Synthesis of the Perhydroazulene (−)-Isoclavukerin A
作者:Barry M. Trost、Robert I. Higuchi
DOI:10.1021/ja961561m
日期:1996.1.1
illustrated for the first time. A one-pot, three-component coupling protocol provides a facile new entry into acyl-substituted TMM precursors specifically and α-hydroxyketones more generally. The methodology led to a total synthesis of (−)-isoclavukerin A. The shortest version of the synthesis involves eleven steps from methallyl alcohol.
影响三亚甲基甲烷 (TMM) 环加成立体控制的因素在全氢菘烯合成的背景下进行了检查。相对于受体的非对映选择性是在与五碳系链的分子内 [3 + 2] 反应中建立的。当使用双激活受体时,观察到完全选择性,其中 Z 位激活基团被提议作为非对映选择性控制元件。此外,首次说明了使用三甲基乙酸锡酯作为助催化剂对缺电子烯烃进行环加成。一锅三组分偶联方案提供了一种轻松的新进入,特别是酰基取代的 TMM 前体和更普遍的 α-羟基酮。该方法导致 (-)-isoclavukerin A 的全合成。
Structure and Absolute Configuration of Isoclavukerin A, A Component from an Okinawan Soft Coral
作者:Takenori Kusumi、Toshiyuki Hamada、Motoko Hara、Midori O. Ishitsuka、Haro Ginda、Hiroshi Kakisawa
DOI:10.1016/0040-4039(92)88129-s
日期:1992.4
Structure of isoclavukerin A (1), a marine terpenoid isolated from the softcoral Clavularia species, has been determined spectroscopically, and its absolute configuration has been elucidated by the CD and the modified Mosher's methods that are applied to the derivatives of 1.