Several 1,3-disubstituted-1,4-dihydropyridines with dimethyl acetylenedicarboxylate gave 1-azabicyclo-[4,2,0]octa-2,5-dienes, and where a 3-CO2H or a 3-CONHR group was present elimination of this group occurred through a 6-membered cyclic transition state in each case to give the corresponding 3-(cis-1,2-dimethoxycarbonylvinyl) derivative.
R. M. Acheson and N. D. Wright, J. Chem. Soc. D, 1971, 1421 DOI: 10.1039/C29710001421
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