Synthesis of Pterocarpan-Type Heterocycles via Oxidative Cycloadditions of Phenols and Electron-Rich Arenes

Autor: Amber L. Mohr, Gary W. Morrow, Vincent M. Lombardo, Teresa M. Arisco
Rok vydání: 2009
Předmět:
Zdroj: Synthetic Communications. 39:3845-3855
ISSN: 1532-2432
0039-7911
Popis: Oxidation of 4-alkoxyphenols or 4-methoxynaphthol with phenyl iodonium(bis)trifluoroacetate (PIFA) in the presence of electron rich 2H-chromenes or dihydronaphthalenes affords pterocarpans or 5-carbapterocarpans via a formal [3 + 2] cycloaddition process. Acid-catalyzed ionization of quinone dimethylmonoacetal in the presence of 7-methoxy-2H-chromene gave similar results, suggesting a phenoxonium ion intermediate in the oxidative process.
Databáze: OpenAIRE
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