Indoleninyl-substituted pyrimido[1,2- b ]indazoles via a facile condensation reaction.

A new series of pyrimido[1,2- b ]indazoles bearing indolenine moieties was synthesized through a simple condensation reaction with up to 94% yield. The present method features the versatile formation of a pyrimidine ring with a broad range of substrates, great functional group compatibility and facile synthetic operation. The work offers opportunities in drug development as well as in materials science.