Metal‐Free Synthesis of Selenodihydronaphthalenes by Selenoxide‐Mediated Electrophilic Cyclization of Alkynes
作者:Shaoyu An、Zhong Zhang、Pingfan Li
DOI:10.1002/ejoc.202100423
日期:2021.6.7
A metal-free, one-pot selenium mediated electrophiliccyclization reaction of alkynes and triflic anhydride-activated selenoxides was realized, giving selenium containing dihydronaphthalene products, including selenium-substituted phenanthrene, dihydroquinoline, 2H-chromene, and coumarin.
Formation of C(sp<sup>2</sup>)Boronate Esters by Borylative Cyclization of Alkynes Using BCl<sub>3</sub>
作者:Andrew J. Warner、James R. Lawson、Valerio Fasano、Michael J. Ingleson
DOI:10.1002/anie.201505810
日期:2015.9.14
BCl3 is an inexpensive electrophile which induces the borylativecyclization of a wide range of substituted alkynes to regioselectively form polycycles containing synthetically versatile C(sp2)boronateesters. It proceeds rapidly, with good yields and is compatible with a range of functional groups and substitution patterns. Intermolecular 1,2‐carboboration of alkynes is also achieved usingBCl3 to
Sulfur-Mediated Electrophilic Cyclization of Aryl-Substituted Internal Alkynes
作者:Zhong Zhang、Pan He、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1021/acs.joc.9b00136
日期:2019.4.5
A sulfur-mediated electrophiliccyclization reaction of aryl-tethered internal alkynes has been developed. Triflic anhydride-activated sulfoxides induced the electrophiliccyclization and then demethylation with triethylamine in one pot, affording 3-sulfenyl-1,2-dihydronaphthalenes and related types of products in yields of ≤96%.
HgCl<sub>2</sub>-Catalyzed Benzylation of 1-Aryl-1-propynes
作者:Shengming Ma、Lisha Wang
DOI:10.1021/jo972269f
日期:1998.5.1
Gold‐Catalyzed 1,2‐Dicarbofunctionalization of Alkynes with Organohalides**
作者:Shashank P. Sancheti、Yukta Singh、Manoj V. Mane、Nitin T. Patil
DOI:10.1002/anie.202310493
日期:2023.10.16
The first report of 1,2-dicarbofunctionalization of alkynes using organohalides as coupling partners in the field of goldcatalysis has been presented. Mechanistic investigations, including NMR, tandem mass spectrometry and DFT studies, reveal that an oxidative addition/carbophilic activation pathway is preferred over the migratory insertion/cis-trans isomerization pathway.