Gold-Catalyzed 1,2-Acyloxy Migration/Coupling Cascade of Propargyl Diazoacetates: Synthesis of Isomycin Derivatives
作者:Ming Bao、Xin Wang、Lihua Qiu、Wenhao Hu、Philip Wai Hong Chan、Xinfang Xu
DOI:10.1021/acs.orglett.9b00392
日期:2019.3.15
An efficient gold(I)-catalyzed carbocyclization reaction for the synthesis of isomycin derivatives from propargyl diazoacetates has been developed. The suggested cyclization pathway delineated the first example of a vinyl gold carbenoid species generated in situ from gold(I)-catalyzed 1,2-acyloxy migration and intercepted by a cross-coupling reaction with the remaining tethered diazo functionality
A novel gold-catalyzed water-mediated carbene cascadereaction of propargyl diazoacetates has been developed. Mechanistic investigation indicates that this reaction is initiated by gold-catalyzed gold–carbene formation followed by an unprecedented 6-endo-dig carbocyclization with tethered alkyne through an oxonium ylide intermediate, terminated by a β-H elimination/protodeauration process to give the
Copper-catalyzed addition of water affording highly substituted furan and unusual formation of naphthofuran ring from 3-(1-alkenyl)-2-alkene-1-al
作者:Rathin Jana、Sunanda Paul、Anup Biswas、Jayanta K. Ray
DOI:10.1016/j.tetlet.2009.10.125
日期:2010.1
We have developed a novel one-pot reaction to generate highly substituted furan through the addition of water followed by oxidation and unusual cyclization to naphthofuran ring under the same reaction condition.