A Metal-Free Oxidation of Benzo[c]chromen to Benzo[c]chromen-6-ones by t-Butyl Hydroperoxide in the Presence of Potassium Iodide
摘要:
An effective and eco-friendly oxidation method for the synthesis of benzo[c]chromen-6-ones is described. The condition constitutes 6 molar ratio TBHP, catalytic KI and pyridine in acetonitrile as the solvent. Altogether, 16 structurally diverse substituted benzo[c]chromen-6-ones were prepared through this protocol from corresponding benzo[c]chromenes in excellent yields.
ortho-arylation of phenols by (2-cyanoaryl)azo t-butyl (or phenyl) sulfides in SRN1 conditions, followed by a silica-gel-catalysed lactonisation of the resulting 2-cyano-2′-hydroxybiphenyls, leads to dibenzo[b,d]pyran-6-ones.