Cyclization of Dialkyl-(4-hydroxy-2-butynyl)(3-alkenylpropargyl)ammonium Salts and Recyclization of the 2,2-Dialkyl-4-hydroxymethylisoindolinium Salts Obtained
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2,2-Dialkyl-4-hydroxymethylisoindolinium chlorides, like benzisoindolinium salts, readily undergo intramolecular recyclization under conditions of aqueous alkaline decomposition, comprising fission of the isoindolinium ring and formation of a dihydrofuran ring leading to (1,3-dihydro-4-isobenzofuranylmethyl)dialkylamines.
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