We developed a chemoselective oxidative dearomative spiroetherification and spiroamination of arenols using I+/oxone catalysis. The intramolecular dearomative C-O and C-N couplings proceeded much more efficiently under slightly acidic conditions to give the corresponding spiro adducts in higher yields compared with previous methods using transition metal or hypervalent iodine catalysts. Control experiments
Ruthenium(VIII)-Catalyzed <i>ipso</i>-Dearomative Spiro-Etherification and Spiro-Amidation of Phenols
作者:Debayan Sarkar、Nilendri Rout
DOI:10.1021/acs.orglett.9b01322
日期:2019.6.7
An open air ruthenium(VIII)-catalyzed oxidative spiro-etherification as well as spiro-amidation of phenols has been performed. The transformation works satisfactorily with both phenols and naphthols and thus exhibits a wide range of flexibility. The catalysis is performed in open air at room temperature with a yield of ≤95%.