Vinylic substitution on troponoid catalyzed by palladium complexes, and formation of new C-pd σ-complexes of troponoid
作者:Hiroshi Horino、Naoto Inoue、Toyonobu Asao
DOI:10.1016/0040-4039(81)80139-6
日期:1981.1
The reaction of 3-, 4- and 5-halotropolones with olefins catalyzed by palladium (O) complex gave 3-, 4- and 5-(substitutedvinyl) tropolones respectively. Similarly, 2-chlorotropone gave 2-styryltropones. Some tropolonyl- and troponylpalladium-σ-complexes were synthesized.
Asymmetric Synthesis of Bicyclo[4.3.1]decadienes and Bicyclo[3.3.2]decadienes via [6 + 3] Trimethylenemethane Cycloaddition with Tropones
作者:Barry M. Trost、Patrick J. McDougall、Olaf Hartmann、Peter T. Wathen
DOI:10.1021/ja806979b
日期:2008.11.12
trimethylenemethane donor undergoes palladium-catalyzed [6 + 3] cycloaddition with a variety of tropones to yield bicyclo[4.3.1]decadienes in excellent regio-, diastereo-, and enantioselectivity. Products of the Pd-TMM [6 + 3] cycloaddition participate in a thermal [3,3] sigmatropic rearrangement to yield bicyclo[3.3.2]decadienes in good yield.
Ring-Expansion Protocol: Preparation of Synthetically Versatile Dihydrotropones
作者:Young-Sun Do、Ruiying Sun、Hee Jin Kim、Jung Eun Yeo、Sung-Hee Bae、Sangho Koo
DOI:10.1021/jo802064c
日期:2009.1.16
furnished versatile dihydrotropones 6. Maintaining Z-configuration in the oxidative ring-opening products 3 is crucial for the success of the ring-expansion strategy. Dihydrotropones 6 are ripe for further elaborations such as oxidation to tropones 8 and Diels−Alder reaction with the Danishefsky′s diene 10 to afford polycyclic compounds 12.
Application of Lewis Acid Catalyzed Tropone [6+4] Cycloadditions to the Synthesis of the Core of CP-225,917
作者:Ljubomir Isakovic、James A. Ashenhurst、James L. Gleason
DOI:10.1021/ol016814h
日期:2001.12.1
The carbocyclic core of CP-225,917 and CP-263,114 is accessible through the [6+4] cycloaddition of a tropone with a 2-substituted cyclopentadiene. Examination of this reaction has revealed for the first time that this cycloaddition process is catalyzed by Lewis acids, including lanthanide triflates. Cycloadditions of several mono-, di-, and trisubstituted tropones with 2-silyloxycyclopentadienes using