Palladium(II)-catalyzed tandem annulation reaction of o-alkynylbenzoates with methyl vinyl ketone for the synthesis of isocoumarins
作者:Huan Wang、Xiuling Han、Xiyan Lu
DOI:10.1016/j.tet.2013.07.057
日期:2013.10
A palladium(II)-catalyzed highly regioselective tandem reactions of o-alkynylbenzoates with methyl vinyl ketone for the synthesis of isocoumarins was developed. It is a convenient, mild and environmentally benign reaction with moderate to high yield. The reaction is initiated by the Pd(II) species and regenerate the Pd(II) species to complete the catalytic cycle without the necessity of a redox system
A non‐oxidant and metal‐free strategy for synthesizing iso‐coumarin by using a continuous electrochemical microreactor to initiate an oxidative cyclization reaction of o‐(1‐alkynyl) benzoate and radicals. This efficient and clean continuous electrosynthesis method not only avoids the complicated gas protection operation and production of by‐products in the batch processes, but also help to overcome
In Situ Formation of RSCl/ArSeCl and Their Application to the Synthesis of 4-Chalcogenylisocumarins/Pyrones from <i>o</i>-(1-Alkynyl)benzoates and (<i>Z</i>)-2-Alken-4-ynoates
作者:Linlin Xing、Yong Zhang、Bing Li、Yunfei Du
DOI:10.1021/acs.orglett.9b01046
日期:2019.5.17
diorganyl disulfides or diselenides with PhICl2 in acetonitrile was found for the first time to lead to the in situ formation of organosulfenyl chloride or selenenyl chloride, which enables the regioselective intramolecular chalcogenylacyloxylation of alkynes resulting in the formation of 4-chalcogenylisocumarins/pyrones in good to excellent yields under metal-free conditions.
Trifluoromethylthiolation/Selenolation and Lactonization of 2-Alkynylbenzoate: The Application of Benzyl Trifluoromethyl Sulfoxide/Selenium Sulfoxides as SCF<sub>3</sub>/SeCF<sub>3</sub> Reagents
作者:Haofeng Shi、Xingzong Wang、Xiaoxian Li、Beibei Zhang、Xuemin Li、Jingran Zhang、Jingyue Yang、Yunfei Du
DOI:10.1021/acs.orglett.2c00563
日期:2022.3.25
The combined use of BnS(O)CF3/BnSe(O)CF3 with Tf2O as SCF3/SeCF3 reagents was implemented to realize an efficient synthesis of biologically interesting 4-(trifluoromethylthio/trifluoromethylseleno)isocoumarins from 2-alkynylbenzoates. The mechanistic pathway was postulated to involve formation of the electrophilic SCF3/SeCF3 species via interrupted Pummerer reactions followed by a concerted triflu
Synthesis of selenated isochromenones by AgNO<sub>3</sub>-catalyzed three-component reaction of alkynylaryl esters, selenium powder and ArB(OH)<sub>2</sub>
We reported AgNO3-catalyzed three-component reaction of alkynylaryl esters, selenium powder and ArB(OH)2, providing an efficient synthetic route to selenated isochromenones.