The phenyliodonium ylide of 2-hydroxy-1,4-naphthoquinone reacts with aminoesters, ureas, aminoalcohols and aminophenols in refluxing dichloromethane to afford good yields of indanedione 2-carboxamido compounds, that in solution exist in an enol-amide form. The same reactants in a copper-catalyzed reaction afford mainly the corresponding N-arylo compounds. Arylhydrazines are mainly oxidized by the ylide and arylation occurs only in a low yield.
Aryliodonium ylides of 2-hydroxy-1,4-naphthoquinone react with amines in refluxing dichloromethane to afford good yields of indanedione 2-carboxamides 5, through a ring-contraction and alpha,alpha'-dioxoketene formation reaction. These amides exist in solution in an unusual enol-amide form. In contrast, the same reactants in a copper-catalyzed reaction afford arylamines and 3-iodo-4-hydroxy-1,2-naphthoquinone.
Phenyliodoniophenolates from 1,3-dihydroxybenzene derivatives
作者:Spyros Spyroudis、Petroula Tarantili
DOI:10.1016/s0040-4020(01)89291-7
日期:1994.1
derivatives and (diacetoxyiodo)benzene were isolated and characterized. The new phenolates afforded cyclization products from their photochemical reaction with alkenes and alkynes and phenylethers from their thermalrearrangement. A possible reaction pathway is proposed in order to explain the regioselectivity of these reactions.