Radical Cation Diels–Alder Cycloadditions by Visible Light Photocatalysis
作者:Shishi Lin、Michael A. Ischay、Charles G. Fry、Tehshik P. Yoon
DOI:10.1021/ja2093579
日期:2011.12.7
Ruthenium(II) polypyridyl complexes promote the efficient radicalcation Diels-Alder cycloaddition of electron-rich dienophiles upon irradiation with visible light. These reactions enable facile [4 + 2] cycloadditions that would be electronically mismatched under thermal conditions. Key to the success of this methodology is the availability of ligand-modified ruthenium complexes that enable rational
钌 (II) 多吡啶基配合物在可见光照射下促进富电子亲二烯体的有效自由基阳离子 Diels-Alder 环加成反应。这些反应使 [4 + 2] 环加成能够在热条件下发生电子失配。这种方法成功的关键是配体修饰的钌配合物的可用性,这些配合物能够合理调整催化剂的电化学性能,而不会显着扰乱系统的整体光物理性能。
Carboxylic acid addition to terminal alkynes utilizing ammonium tagged Hoveyda-Grubbs catalyst supported on magnetically separable core/shell silica: A highly reusable and air compatible catalytic system
作者:Bengi Özgün Öztürk、Didar Gürcü、Solmaz Karabulut Şehitoğlu
DOI:10.1016/j.jorganchem.2019.01.005
日期:2019.3
core/shell silica gel was tested on carboxylicacid addition reactions to terminal alkynes using a variety of carboxylicacidderivatives under air atmosphere. The catalytic system was found to be compatible with air atmosphere and can tolerate even non-degassed solvents. The reaction parameters such as temperature, substrate/catalyst ratio and the effect of carboxylicacid on the selectivity and yield of
Palladium catalysed β-selective oxidative Heck reaction of an electron-rich olefin
作者:Lingkui Meng、Chao Liu、Wei Zhang、Chao Zhou、Aiwen Lei
DOI:10.1039/c3cc47045h
日期:——
A palladium catalysed oxidative beta-arylation of an electron-richolefin is described. The reaction was under mild conditions; meanwhile, additives and directing groups are not needed. Various arylboronic acids worked well under the standard conditions.
Heck,R.F., Organometallics in Chemical Synthesis, 1972, vol. 1, p. 455 - 462
作者:Heck,R.F.
DOI:——
日期:——
Stereoselective Synthesis of Vinyl Ethers by the Reaction of N-(Arylidene(or alkylidene)amino)-2-azetidinones with Ozone
作者:Benito Alcaide、Javier Perez-Castells、Concepcion Polanco、Miguel A. Sierra
DOI:10.1021/jo00124a008
日期:1995.9
Ozonolysis of N-(arylidene(or alkylidene)amino)-2-azetidinones followed by NaBH4 workup yields enol ethers in good yields with high levels of stereoselectivity. Di- and trisubstituted olefin derivatives are available through this procedure. Chiral 2-azetidinones lead to enol ethers with a chiral moiety without racemization. The reaction is thought to occur through a novel B-type fragmentation of the 2-azetidinone ring. This process is closely related to the well-known N-nitrosoamide to ester rearrangement and the decarboxylation of oxetan-2-ones.