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.
Stereospecific and Stereoselective Rhodium(I)-Catalyzed Intramolecular [2+2+2] Cycloaddition of Allene-Ene-Ynes: Construction of Bicyclo[4.1.0]heptenes
Treatment of the allene‐ene‐yne substrates with [RhCl(CO)2}2] effected the intramolecular [2+2+2]‐type ring‐closing reaction to produce various of tri‐ and tetracyclic derivatives containing a cyclopropane ring. The reaction is highly stereoselective as well as stereospecific with good to excellent yields.
Ruthenium-Catalyzed Cycloisomerizations of Diynols
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja043097o
日期:2005.4.1
[CpRu(CH(3)CN)(3)]PF(6). The formation of five- and six-memberedrings is possible using this methodology. Secondary diynols react to form single geometrical isomeric dienones and -als. Primary diynols undergo a cycloisomerization as well as a hydrative cyclization process. The utility of primary diynol cycloisomerization is demonstrated in a synthesis of (+)-alpha-kainic acid.
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.
intramolecular rhodium(I)‐catalyzed [2+2+2] cycloaddition of allenynes with alkynes is described. A range of diverse polysubstituted benzene derivatives could be synthesized in good to excellent yields, in which the allenynes served as synthetic equivalent to the diynes. A high regioselectivity could be observed when allenynes were treated with unsymmetrical alkynes.
Rapid Assembly of the Salvileucalin B Norcaradiene Core
作者:Sergiy Levin、Roger R. Nani、Sarah E. Reisman
DOI:10.1021/ol902848k
日期:2010.2.19
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.