2H-Cyclohepta[b]furan-2-one (1) reacted with TPT, electrophilically to give 3-dihydropyridinyl-2H-cyclohepta[b]furan-2-one and subsequent treatment with sodium hydroxide in ethanol gave 3-(4-pyridinyl)-2H-cyclohepta[b]furan-2-one in excellent yields.Furthermore, it reacted with methyl iodide give a corresponding pyridinium salt easily.
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Morita et al. (2006) studied this question.
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