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.
Facile synthesis of sulfenyl-substituted isocoumarins, heterocycle-fused pyrones and 3-(inden-1-ylidene)isobenzofuranones by FeCl3-promoted regioselective annulation of o-(1-alkynyl)benzoates and o-(1-alkynyl)heterocyclic carboxylates with disulfides
作者:Zhen Li、Jianquan Hong、Linhong Weng、Xigeng Zhou
DOI:10.1016/j.tet.2011.12.003
日期:2012.2
Reported herein is the FeCl3-promoted intermolecular sulfoesterification of o-(1-alkynyl)benzoates with disulfides, which provides a convenient and efficient method for synthesis of 4-sulfenylisocoumarins. Various functional groups such as methoxy, halides, ester, cyano and silicon groups in the substrates are tolerated, and heterocycle-fused chalcogenylpyrones are also successfully achieved directly
Synthesis of chalcogen-functionalized 4<i>H</i>-chromen-4-ones <i>via</i> cyclization/chalcogenation of alkynyl aryl ketones mediated by Selectfluor®
作者:Thiago Anjos、Elba L. Gutterres、Daniela A. Barancelli、Roberta Cargnelutti、Benhur Godoi、Thiago Barcellos、Ricardo F. Schumacher
DOI:10.1039/d2nj05567h
日期:——
starting from diorganyl dichalcogenides and alkynyl aryl ketones has been developed. Selectfluor® mediates these cyclization/organochalcogenation reaction sequences under mild and open-to-air conditions. The six-memberedheterocycles were obtained via a selective 6-endo-dig cyclization compatible with the use of both diorganyl diselenides and disulfides. This synthetic methodology still proved to be