Novel Catalytic Tandem Isomerisation/Cyclisation Reaction of α‐Methallyloxy Carboxylic Acids

Abstract
A new tandem isomerisation/cyclisation of α‐methallyloxy carboxylic acids leading to substituted 1,3‐dioxolan‐4‐ones in 60–70 % yields was catalysed by Cu(OTf)2 or Al(OTf)3. Extension to the synthesis of oxathiolanones and oxathianones is also described. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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