Generation of heterocyclic quinone methides from ortho-hydroxy methyl derivatives and a study of their cycloaddition reactions
作者:Marek A. Chauncey、Michael F. Grundon、Mary J. Rutherford
DOI:10.1039/c39880000527
日期:——
Quinolinone quinonemethide (1a), prepared from 1,3-dimethyl-4-hydroxyquinolin-2-one and 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ), gives a dimer (5) and reacts in situ with 2,2-dimethyl-2H-1-benzopyran, and with isopropenyl acetate, to give Diels–Alder cycloaddition products; coumarin quinonemethides behave similarly with 2,2-dimethylbenzopyran, but with isopropenyl acetate and with 2,3-benzofuran