2-Phenylethnylpyridine reacted with dimethyl acetylenedicarboxylate (DMAD) in the presence of a proton source such as an alcohol to give Indolizines having methoxycarbonyl groups at the 2- or 2,3-positions in high yields.
N. Nishiwaki, K. Furuta, M. Komatsu and Y. Ohshiro, J. Chem. Soc., Chem. Commun., 1990, 1151 DOI: 10.1039/C39900001151
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