Add time:07/26/2019         Source:sciencedirect.com

Thermally induced non-catalytic assembling of salicylaldehydes and dimedone in water or ethanol affords 9-(2-hydroxy-4,4-dimethyl-6-oxo-1-cyclohexen-1-yl)-3,3-dimethyl-2,3,4,9-tetrahydro-1H-xanthen-1-ones in 85–95% yields as a sequence of Knoevenagel and Michael reactions.

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