Efficient Synthesis of N-(9-Xanthyl)-4-Toluenesulfonamides Enabled by an Addition-Cyclization Cascade of Arynes
作者:Chong-Dao Lu、Shan-Shan Lu
DOI:10.1055/s-0032-1318311
日期:——
An efficient synthesis of N-(9-xanthyl)-4-toluenesulfonamides is described in which salicyl N-tosylimines react with silylaryl triflates in the presence of CsF. This mild process involves an addition-cyclization cascade in which arynes are generated and trapped in situ.
Benzylic Oxidation and Functionalizations of Xanthenes by Ligand Trasfer Reactions of Hypervalent Iodine Reagents
on the xanthenes, and the yield of 2-nitroxanthone 2c was only 44% after the reaction for 24 h. Unfortunately, the yield was not improved at an elevated reaction temperature due to the over-oxidation of the product and partial ring-bromination of the xanthene aromatic ring. For the methyl-substituted xanthene 1d, the reaction was highly chemoselective at the xanthene benzylic position and the methyl