Regioselective Addition of Grignard Reagents to Substituted Tropones
摘要:
Methyl magnesium bromide has been reacted with a variety of substituted tropones to establish addition regioselectivity patterns. High levels of selectivity were observed in each case examined, and the resultant dihydrotropones were easily converted into highly substituted cycloheptatrienes.
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
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.