Rapid Assembly of the Salvileucalin B Norcaradiene Core
摘要:
Preparation of the polycyclic core of the cytotoxic natural product salvileucalin B is described. The key feature of this synthetic strategy is a copper-catalyzed intramolecular arene cyclopropanation to provide the central norcaradiene. These studies lay the foundation for continued investigations toward an enantioselective total synthesis of 1.
Rh-Catalyzed [2 + 2 + 2] Cycloadditions with Benzoquinones: De Novo Access to Naphthoquinones for Lignan and Type II Polyketide Synthesis
作者:James M. Wood、Eufrânio N. da Silva Júnior、John F. Bower
DOI:10.1021/acs.orglett.9b04266
日期:2020.1.3
The first examples of Rh-catalyzed [2 + 2 + 2] cycloadditions between diynes and benzoquinones are described. The method enables de novo and step-economical access to challenging naphthoquinones that are of relevance to lignan and type II polyketide synthesis. The value of the chemistry is demonstrated by a short total synthesis of justicidone.
A Domino Approach to Dibenzopentafulvalenes by Quadruple Carbopalladation
作者:Jan Wallbaum、Roman Neufeld、Dietmar Stalke、Daniel B. Werz
DOI:10.1002/anie.201307793
日期:2013.12.9
Four at one stroke: A quadrupledominocarbopalladation reaction gives access to highly substituted dibenzopentafulvalenes and the complete pentafulvalene backbone is constructed in only one synthetic step. Structural and electronic properties have been evaluated by X‐ray crystallography and cyclovoltammetry.