A Lewis acid-catalyzed three-step tandem synthesis of 9-arylfluorene was developed by simply heating a mixture of 2-formyl biphenyl, TsNCO and an arene. In the absence of arene, a two-step tandem synthesis of 9-sulfonylaminofluorene was achieved. These advances were mainly attributed to the discovery of an anhydrous synthesis of N-tosyl arylaldimines from TsNCO and arylaldehydes.
D. Huang, W. Yang, J. Zhang, X. Wang, X. Wang and Y. Hu, RSC Adv., 2016, 6, 47570 DOI: 10.1039/C6RA03889A
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