Synthesis of substituted 6H-benzo[c]chromenes: a palladium promoted ring closure of diazonium tetrafluoroborates |
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Authors: | Jing Zhou Liang-Zhu Huang You-Qiang Li Zhen-Ting Du |
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Institution: | College of Science, Northwest A&F University, Yangling 712100, Shaanxi Province, PR China |
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Abstract: | A highly efficient palladium-catalysed phenyl diazonium tetrafluoroborate participation of C–H activation ring closure protocol has been developed. A series of 6H-benzoc]chromenes have been synthesized by intramolecular cyclization of ortho diazonium salts tetrafluoroborate of benzyloxyphenyl (Method A), or phenoxymethyl phenyl (Method B). The transformation allows the synthesis of 6H-benzoc]chromenes with a wide variety of functional groups and substitution patterns from simple and easily accessible precursors. |
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