已经开发了使用炔烃的铜催化分子内NH / CH环合反应。各种稠密官能化的杂环,如吡咯并[1,2- a ]吲哚,吲哚并[1,2 - c ]喹唑啉-2-酮,恶唑并[3,4- a ]吲哚和咪唑[1,5-由于苯胺部分,连接子部分和炔烃部分具有高度模块化的特征,因此以原子和分步经济的方式合成了α ]吲哚。通过简单地改变从二氧化剂叔将过氧化叔丁基(DTBP)转化为2,2,6,6-四甲基哌啶-1-氧基(TEMPO),该反应很容易转化为氨氧化途径,该途径从TEMPO夺取一个氧原子以生成5-芳酰基吡咯2个 机理实验表明,乙烯基自由基参与了该反应,而酰胺基自由基引发的自由基级联反应可能是造成这种转变的原因。
Sequential Ru−Pd Catalysis: A Two-Catalyst One-Pot Protocol for the Synthesis of N- and O-Heterocycles
作者:Barry M. Trost、Michelle R. Machacek、Brian D. Faulk
DOI:10.1021/ja060812g
日期:2006.5.1
differs between the use of amine versus alcohol nucleophiles. The method also affords heterocyclic products that are synthetically useful intermediates. Through the Z-vinylsilane a variety of stereodefined trisubstituted olefin products can be accessed including several all-carbon motifs. Finally, the utility of these heterocyclic products in total synthesis is demonstrated through concise syntheses
The Novel Skeletal Rearrangement of Cyclopentanones into Hydroazulenones via a Radical Process and its Application to the Formal Synthesis of Damsinic Acid
rearrangement of cyclopentanones with pentynyl side chains into hydroazulene compounds via a radicalprocess was developed. The presence of a triethylsilyloxy group at the α-position of the cyclopentanone was found to increase the reactivity. Except for this, there was no limitation of the reaction. The reaction was also applied to synthetic studies of damsinic acid, which was isolated from Ambrosia ambrosioides