New method for the synthesis of chromeno[4,3-b]chromene derivatives via multicomponent reaction promoted by niobium pentachloride
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DOI: 10.1016/j.tetlet.2017.01.062
Abstract: Abstract Chromeno[4,3-b]chromene derivatives were synthesized from multicomponent reaction between 4-hydroxycoumarin, aryl aldehyde derivatives and 1,3-cyclohexanedione promoted by niobium pentachloride. This new method is simple, cost-effective, provides good yields with good substrate generality and can be… read more here.
Keywords: multicomponent reaction; promoted niobium; chromene derivatives; reaction ... See more keywords