Cyclopentene Annulations of Alkene Radical Cations with Vinyl Diazo Species Using Photocatalysis
作者:Francisco J. Sarabia、Qiankun Li、Eric M. Ferreira
DOI:10.1002/anie.201805732
日期:2018.8.20
A direct (3+2) cycloaddition between alkenes and vinyl diazo reagents using either Cr or Ru photocatalysis is described. The intermediacy of a radicalcation species enables a nucleophilic interception by vinyl diazo compounds, a departure from their traditional electrophilic behavior. A variety of cyclopentenes are synthesized using this method, and experimental insights implicate a direct cycloaddition
One-Pot Synthesis of Fused Benzo[c]carbazoles by Photochemical Intramolecular Annulation of 3-Acyl-2-haloindoles with Tethered Styrenes
作者:Shen-Ci Lu、Shi-Chao Wei、Wei-Xia Wang、Wei Zhang、Zhi-Feng Tu
DOI:10.1002/ejoc.201100876
日期:2011.10
the synthesis of fusedbenzo[c]carbazoles has been achieved in moderate to high yields by the one-potphotochemicalannulation of 3-acyl-2-haloindoles with tetheredstyrenes by photoinduced electron-transfer coupling, electrocyclic reactions, and deacylative aromatization in the presence of pyridine. Fused furo[2,3-c]carbazoles were also synthesized under the same conditions. 5,6-Dihydrobenzo[c]pyrrolo[1
Lewis Acid Catalyzed Intramolecular [4+2] Cycloaddition of In Situ Generated Aza‐Quinone Methides for the Stereoselective Synthesis of Furo/pyrano[3,2‐
<i>c</i>
]tetrahydroquinolines
作者:Santosh J. Gharpure、Dharmendra S. Vishwakarma
DOI:10.1002/ejoc.201901598
日期:2020.11.30
A TMSOTf‐catalyzed intramolecular [4+2] cycloaddition of in situ generated aza‐o‐quinone methide acts as an expedient, stereoselective access to cis/trans‐fused furo‐/pyrano[3,2‐c]tetrahydroquinolines with excellent yields and diastereoselectivity.
TMSOTf催化的原位生成的氮杂-邻-醌甲基化物的分子内[4 + 2]环加成反应,是对顺式/反式融合的呋喃-/吡喃并[3,2- c ]四氢喹啉的便捷,立体选择途径,并具有优异的收率和非对映选择性。
Tetrahydropyridines via FeCl<sub>3</sub>-Catalyzed Carbonyl–Olefin Metathesis
作者:Katie A. Rykaczewski、Emilia J. Groso、Hannah L. Vonesh、Mario A. Gaviria、Alistair D. Richardson、Troy E. Zehnder、Corinna S. Schindler
DOI:10.1021/acs.orglett.0c00918
日期:2020.4.3
the application of Lewis-acid-catalyzed carbonyl–olefin metathesis toward the synthesis of substituted tetrahydropyridines from commercially available aminoacids as chiral pool reagents. This strategy relies on FeCl3 as an inexpensive and environmentally benign catalyst and enables access to a variety of substituted tetrahydropyridines under mild reaction conditions. The reaction proceeds with complete
Iridium-Catalyzed Cycloisomerization of <i>N</i>-Tethered 1,7-Enynes: Construction of an Azabicyclo[5.1.0]octene System
作者:Sheng Zhao、Zhong-Lin Zang、Siyu Li、Xumei Wen、Chenhui Wang、Jian Guo、Yun He
DOI:10.1021/acs.joc.0c00516
日期:2020.7.17
An efficient method for the synthesis of azabicyclo[5.1.0]octenes through cycloisomerization of nitrogen-tethered 1,7-enynes catalyzed by [IrCp*Cl2]2 was developed. With appropriately designed substrates, this method could be easily employed to generate complex fused ringsystems such as [6-6-3-7], [5-6-3-7], [7-6-3-7], and [8-6-3-7] ringsystems, which enriches the diversity of the cyclopropane-fused