Chemo- and Regioselective Cyclohydrocarbonylation of α-Keto Alkynes Catalyzed by a Zwitterionic Rhodium Complex and Triphenyl Phosphite
摘要:
alpha-Keto alkynes react with CO and H-2 in the presence of catalytic quantities of the zwitterionic rhodium complex (eta(6)-C6H5BPh3)Rh--(+)(1,5-COD) and triphenyl phosphite affording either the 2-, 2(3H)-, or 2(5H)-furanones in 61-93% yields. The cyclohydrocarbonylation is readily accomplished using substrates containing alkyl, aryl, vinyl, and alkoxy groups at the acetylenic terminal, as well as a variety of primary, secondary, and tertiary alkyl, aryl, and heteroaryl groups connected to the ketone functionality. Structural and electronic properties present in the starting materials mediate the chemo- and regioselectivity of the reaction.
Photocycloaddition of Enynones (4-Acylbut-1-en-3-ynes) to Alkenes
作者:Inga Inhülsen、Paul Margaretha
DOI:10.1021/ol902827s
日期:2010.2.19
The title compounds undergo regio- and diastereoselective [2+2]-cycloaddition at the olefinic C-C bond on irradiation (350 nm) in the presence of either methacrylonitrile or 2,3-dimethylbuta-1,3-diene, affording hitherto unknown 1-cyclobutylalk-1-yn-3-ones or 1-bicyclo[4.2.0]octylalk-1-yn-3-ones, respectively.
Synthesis of acetylenic ketones
作者:A. S. Zanina、S. I. Shergina、I. E. Sokolov、I. L. Kotlyarevskii
DOI:10.1007/bf00958843
日期:1990.11
A general preparative method of synthesis of acetylenic ketones was developed based on acylation of terminal acetylenes with acid chlorides in the presence of Cu(I) chloride.
A new route for the synthesis of 1,3-diketones
作者:A. S. Zanina、S. I. Shergina、I. E. Sokolov、R. N. Myasnikova
DOI:10.1007/bf00698504
日期:1995.4
A simple route for the synthesis of 1,3-diketones by the reaction of acetylenic ketones with amines followed by hydrolysis of the resulting aminovinylketons is suggested.
Chemo- and Regioselective Cyclohydrocarbonylation of α-Keto Alkynes Catalyzed by a Zwitterionic Rhodium Complex and Triphenyl Phosphite
作者:Bernard G. Van den Hoven、Bassam El Ali、Howard Alper
DOI:10.1021/jo000230w
日期:2000.6.1
alpha-Keto alkynes react with CO and H-2 in the presence of catalytic quantities of the zwitterionic rhodium complex (eta(6)-C6H5BPh3)Rh--(+)(1,5-COD) and triphenyl phosphite affording either the 2-, 2(3H)-, or 2(5H)-furanones in 61-93% yields. The cyclohydrocarbonylation is readily accomplished using substrates containing alkyl, aryl, vinyl, and alkoxy groups at the acetylenic terminal, as well as a variety of primary, secondary, and tertiary alkyl, aryl, and heteroaryl groups connected to the ketone functionality. Structural and electronic properties present in the starting materials mediate the chemo- and regioselectivity of the reaction.
Non‐Diazo C−H Insertion Approach to Cyclobutanones through Oxidative Gold Catalysis
Cyclobutanones are synthetically versatile compounds that often require extensive effort to access. Herein, we report a facile synthesis of cyclobutanones based on the C(sp3)−H insertion chemistry of oxidatively generated gold carbenes. Various cyclobutanones were obtained in syntheticallyuseful yields from substrates with minimal structural prefunctionalization. This discovery reveals new synthetic utilities