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%.