期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 81, 期 22, 页码 11297-11304出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.6b02271
关键词
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资金
- National Natural Science Foundation of Shanxi Province [2015021037]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (STIP) [2015133]
A simple and efficient metal-free sulfenylation/ cyclization of aryl alkynoates has been developed, obtaining various 3-sulfenylated coumarins in moderate to excellent yields. In the presence of BF3 center dot Et2O, the stable and readily accessible N-sulfanylsuccinimides were employed as electro-philes to induce the 6-endo-dig electrophilic cyclization of alkynoates. The reaction using substrates bearing a methoxy group on the phenoxy ring proceeded in an exclusively distinct pathway via either ipso sulfenylcyclization or sulfenylation of the phenoxy ring depending on the different locations of the methoxy substituent. The resulting 3-sulfenylated coumarins can be readily transformed to 3-sulfinylated or 3-sulfonylated coumarins under different oxidation conditions.
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