Ring opening of cyclobutabenzofuranones with TMSI: Facile formation of benzoxepinenones

Asmita Mittra, Sujay Biwas, R V Venkateswaran

Abstract


Cyclobutahenzofuranones ( l a ) undergo regioselective ring opening wrth TMSl to furnish the henzoxepnenones (6-9), respectively. The furanone (S), however, remained unaffected, suggesting the necessity of an additional stabilising group for the generated cationic intemediate for the reaction to proceed.

Keywords


Cyclohutabenrofuranones; TMST; benzoxepmenones

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