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The K2CO3-catalysed double Michael addition of (E)-1,5-diaryl- and 1-alkyl-5-arylpent-4-ene-1,3-diones to 2-trifluoromethyl- and 2-phenyl-substituted 3-nitro-2H-chromenes in dichloromethane at room temperature for 48 h results in 10-aroyl(acyl)-7-aryl-6a-nitro-6,6a,7,8,10,10a-hexahydro-9H-benzo[c]chromen-9-ones in 75-98% yields as individual...

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Endo-1,3-dipolar cycloaddition of azomethine ylides generated in situ from 11H-indeno[1,2-b]quinoxalin-11-one and L-proline/thiaproline to (E)-1,5-diarylpent-4-ene-1,3-diones led to the 3-hydroxy-3-aryl-1-(1'-arylspiro[indeno[1,2-b]quinoxaline-11,3'-(thia)pyrrolizidin]-2'-yl)prop-2-en-1-ones containing the 1,3-diketone fragment. Upon processing of these adducts with arylhydrazine hydrochlorides...

The one-pot regioselective and diastereoselective method for the synthesis of 5-(het)­aroyl-7-(het)­arylhexahydrobenzo­[4,5]­pentaleno­[1,6a-b]­(thia)­pyrrolizine-6,12-diones from accessible 1,5-di­(het)­arylpent-4-ene-1,3-diones or curcuminoids in 38–98% yield was developed. This reaction proceeds as a sequence of 1,3-dipolar cycloaddition of azomethine ylide generated in situ from ninhydrin and (thia)­proline at the CC bond of corresponding enedione, followed by spontaneous intramolecular aldol condensation and leads to the formation of an azatetraquinane scaffold.

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