A straightforward and efficient one-pot protocol for the synthesis of 5-alkylidene-2,3,5,6,7,8-hexahydroimidazo1,2-apyridines is reported. When subjected to the reaction with ethylenediamine in refluxing dioxane, bis-α,β-alkynic ketones, i.e. 1,9-diarylnona-2,7-diyne-1,9-diones, afford 5-alkylidene-2,3,5,6,7,8-hexahydroimidazo1,2-apyridines. Generation...
Yurtoğlu et al. (2025) studied this question.