<scp>L</scp>-Proline catalyzed three component synthesis of pyrano[2,3-<i>c</i>]pyrazole-5-carbonitrile derivatives and <i>in vitro</i> antimalarial evaluation
ABSTRACT An efficient one-pot synthesis of 6-amino-4-(2-chloroquinolin-3-yl)-3-methyl-2, 4-dihydro-pyrano[2,3-c]pyrazole-5-carbonitrile derivatives (4a–f)(5a–f) by threecomponent reactions of 2-chloroquinolin-3-carbaldehyde derivatives, malanonitrile, and 3-methyl pyrazolin-5-one derivatives catalyzed by L-proline in ethanol medium under mild conditions is established. The synthesized compounds were