Affiliation:
1. Department of Chemistry and Centre for Chemico- and Biomedicinal Research, Rhodes University, Grahamstown, 6140, South Africa
Abstract
Reaction of a series of chromone-3-carbaldehydes with methyl vinyl ketone under Baylis–Hillman conditions, using 3-hydroxyquinuclidine in chloroform or DABCO in 1-methyl-2-pyrrolidinone, affords unprecedented tricylic chromone derivatives which, depending on the conditions, may be accompanied by the normal Baylis–Hillman products or their respective tricyclic dimers.
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