Copper-Catalyzed Oxidative Cyclization of 1,5-Enynes with Concomitant C–C Bond Cleavage: An Unexpected Access to 3-Formyl-1-indenone Derivatives
摘要:
A Cu(0)/Selectfluor system-mediated oxidative cyclization of 1,5-enynes with concomitant C-C bond cleavage to access 3-formyl-1-indenone derivatives is described. Preliminary mechanistic investigations disclosed that the C-C bond cleavage involved a novel water-participated oxygen-insertion beta-carbon elimination through double oxy-cuprations.
Palladium-Catalyzed Selective Synthesis of Naphthalenes and Indenones and Their Luminescent Properties
作者:Xiaopeng Chen、Jisong Jin、Ningning Wang、Ping Lu、Yanguang Wang
DOI:10.1002/ejoc.201101506
日期:2012.2
Selectivesynthesis of functionalized naphthalenes and indenones by palladium-catalyzed cyclization of o-haloacetophenones and terminal alkynes in the presence of a secondary amine is reported. Under a nitrogen atmosphere, the palladium-catalyzed reaction of o-haloacetophenones with terminal alkynes in the presence of wet secondary aminesgenerated 1-(dialkylamino)-3-aryl/alkylnaphthalenes. When the
Rhodium(III)-Catalyzed Annulation of Azomethine Ylides with Alkynes<i>via</i>CH Activation
作者:Yuye Chen、Fen Wang、Wencui Zhen、Xingwei Li
DOI:10.1002/adsc.201200924
日期:2013.2.1
The rhodium(III)-catalyzed coupling of azomethineylides with alkynes via CH activation has been developed for the synthesis of indenamines in moderate to high yields. The coupled products can be further oxidized to indenones and derivatives.
A unique gold(I)-catalyzed 5-endo-dig cyclization/aerobic oxidationcascade strategy from 1,5-enyne substrates with molecular oxygen as the oxidant to yield the indenone was described. The reaction mechanism was studied by heavy atom labelling and some related experiments. This method was applied to the formal total synthesis of isoprekinamycin.