A ruthenium-catalyzed 4 + 2 cycloaddition of chromanone diene derivatives using triethylamine (TEA) is described. TEA was employed as an ethylene equivalent, and a bench-stable dinuclear ruthenium complex Ru(p-cymene)Cl22 catalyzed the reaction under mild conditions. This study highlights the utility of TEA as a practical ethylene surrogate and expands the repertoire of ruthenium-catalyzed cycloaddition strategies for the efficient construction of complex molecular architectures.
Manikpuri et al. (Fri,) studied this question.