Thermal cyclisation of 3-acetoxy-3-(2-pyridyl)-2-methylenepropionate esters and related compounds provides convenient access to 2-substituted indolizines. Detailed one- and two-dimensional NMR spectroscopic analysis of the title compounds has facilitated interpretation of their 1H and 13C NMR spectra.
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Bode et al. (1993) studied this question.
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