Experimental study demonstrates efficient synthesis of indenoquinoline dione derivatives using a heteropolyacid catalyst, highlighting an eco-friendly, reusable multicomponent protocol.
An efficient synthesis of indeno[1,2-b]quinoline-9,11(6H,10H)-dione derivatives was reported via four-component coupling reaction of aldehydes, dimedone, 1,3-indandione, and amines in refluxing ethanol or three-component condensation of aldehydes, 1,3-indandione, and 5,5-dimethyl-3-arylamino-cyclohex-2-enone derivatives at 120 °C under solvent-free conditions in the presence of a catalytic amount of Preyssler-type heteropolyacid, H14[NaP5W30O110], as a green and reusable catalyst.
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Heravı et al. (2010) studied this question.
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