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Note | Special issue | Vol 74, No. 1, 2007, pp.961-968
Published online, 26th October, 2007
DOI: 10.3987/COM-07-S(W)26
■ OneOne-Pot Synthesis of Dibenzofuran-1,4-diones

Tetsuya Takeya,* Hiromu Kondo, Kazuho Tomita, Iwao Okamoto, Nobuyoshi Morita, and Osamu Tamura*

*Showa Pharmaceutical University, 3-3165, Higashi-tamagawagakuen, Machida, Tokyo 194-8543, Japan

Abstract

One-pot synthesis of dibenzofuran-1,4-diones 8 from 4-methoxyphenols (or 4-methoxy-1-naphthols) 4 was achieved by oxidative dimerization over a semiconductor in heated, O2-saturated toluene, followed by selective monodemethylation, and oxidative cyclization.