Gold-Catalyzed Cyclization/Oxidative [3+2] Cycloadditions of 1,5-Enynes with Nitrosobenzenes without Additional Oxidants
作者:Chun-Hao Chen、Yen-Ching Tsai、Rai-Shung Liu
DOI:10.1002/anie.201209850
日期:2013.4.22
Golden control: The title reaction (see scheme) proceeds with high stereocontrol to generate the heterocyclic products in good yield. Experiments to probe the mechanism were performed.
A metal‐free dehydrogenative Diels‐Alderreaction of substituted alkenes for the synthesis of tetrahydroisoindolinones has been exploited for the first time. This new method features functional group tolerance and broad substrate scope, providing an efficient access to biologically active tetrahydroisoindolinone skeletons with endo steroselectivity in good to excellent yields.
Halocyclization of o-(alkynyl)styrenes. Synthesis of 3-halo-1H-indenes
作者:Roberto Sanz、Alberto Martínez、Patricia García-García、Manuel A. Fernández-Rodríguez、Muhammad A. Rashid、Félix Rodríguez
DOI:10.1039/c0cc02590a
日期:——
o-(Alkynyl)styrenes undergo halocarbocyclization processes via a 5-endo-dig ring closure. By this strategy an efficient synthesis of 3-halo-1H-indene derivatives has been developed.
Gold-Catalyzed Oxidative Cyclizations of 2-Oxiranyl-1-alkynylbenzenes for Diastereoselective Synthesis of Highly Substituted 2-Hydroxyindanones
作者:Rupsha Chaudhuri、Rai-Shung Liu
DOI:10.1002/adsc.201100325
日期:2011.10
We report the gold-catalyzedoxidativecyclizations of 2-oxiranyl-1-alkynylbenzenes into highlysubstituted 2-hydroxyindanone frameworks bearing a tertiary alcohol. Such gold-catalyzed reactions comprise an initial internal redox reaction, sulfoxide oxidation of α-carbonyl gold-carbenoids, followed by gold-catalyzed formal ene reactions on the resulting diketone intermediates.
Gold(I)-Catalyzed Enantioselective Synthesis of Functionalized Indenes
作者:Alberto Martínez、Patricia García-García、Manuel A. Fernández-Rodríguez、Félix Rodríguez、Roberto Sanz
DOI:10.1002/anie.201001089
日期:2010.6.21
Can you dig it? An asymmetric synthesis of functionalized 1H‐indenes from easily available ortho‐(alkynyl)styrene derivatives under mild reaction conditions has been achieved. The reactions proceed through an unprecedented and selective 5‐endo‐dig gold(I)‐catalyzed cycloisomerization or alkoxycyclization, if water or an alcohol is present (see scheme).