A facile and efficient procedure for one-pot four-component synthesis of polysubstituted spiro pyrano[2,3-<i>c</i>]pyrazole and spiro 1,4-dihydropyridine catalyzed by a Dabco-based ionic liquid under mild conditions

Abstract

Spiro pyrano[2,3-<italic>c</italic>]pyrazoles and spiro 1,4-dihydropyridines were obtained in high yields from different amine components under Dabco-based ionic liquid catalysis.