Synthesis of Acyl Alkenylindium Reagents and Their Application in the Synthesis of (<i>Z</i>)-α,β-Unsaturated Ketones <i>via</i> Palladium-Catalyzed Cross-Coupling Reaction
作者:Youngchul Park、Jiae Min、Dahan Eom、Phil Ho Lee
DOI:10.1021/acs.orglett.5b02043
日期:2015.8.7
was developed involving the hydroindation reaction of allenyl ketones with indium and indium chloride in methanol under mild conditions. Their synthetic applications were demonstrated fromPd-catalyzedcross-coupling reactions with arylbromides and iodides and alkenyl and aryl triflates for the synthesis of (Z)-α,β-unsaturated ketones.
Gold-Catalyzed Regioselective Synthesis of 2- and 3-Alkynyl Furans
作者:Yifan Li、Jonathan P. Brand、Jérôme Waser
DOI:10.1002/anie.201302210
日期:2013.6.24
Chemical Matching: C2‐ or C3‐alkynylated furans were selectively synthesized by using gold catalysis. Direct C–H alkynylation of furans was achieved with C2 selectivity, and a domino cyclization/alkynylation process starting from allenes gave C3‐alkynylated products. The exact matching of the structure of the gold catalyst and an electrophilic hypervalent iodine reagent was essential for success.
A bicyclization reaction with two molecular allenyl ketones and isocyanides: synthesis of a lactone-containing azaspirocycle derivative
作者:Hongdong Yuan、Chongrong Tang、Shikuan Su、Lei Cui、Xueshun Jia、Chunju Li、Jian Li
DOI:10.1039/c9cc02785h
日期:——
A novel bicyclization reaction of twomolecular allenyl ketones and isocyanides has been disclosed. This strategy allows for the construction of structurally complex spirocyclic lactam–lactone systems in an efficient manner. This protocol also demonstrates other advantages such as high synthetic efficiency, atom economy, and broad substrate scope under mild conditions.
New Intramolecular Five-Endo-Mode Cyclization of Allenyl Aryl Ketones
作者:Yoshimitsu Nagao、Woo-Song Lee、Kweon Kim
DOI:10.1246/cl.1994.389
日期:1994.2
A convenient preparation of allenyl aryl ketones was achieved by the Weinreb-modified Grignard reaction of N-methoxy-N-methylamides with propargylmagnesium bromide. On treatment with BF3·OEt2, the allenyl aryl ketones were converted to methylenebenzocyclopetenones via a new 5-endo-mode cyclization.
An efficientsynthesis of substituted indolizine and its benzo derivatives, pyrrolo[1,2-a]quinolines and pyrrolo[2,1-a]isoquinolines, by the reaction of allenyl ketones with α-bromo carbonyl compounds and pyridines (quinoline or isoquinoline) under mild conditions without an added oxidant other than molecular oxygen from air was developed. Notably, allenyl ketones with or without a substituent attached