Synthesis of symmetrical chromeno[2,3-b]chromenes on the basis of о-quinone methides and 1,1-bis(morpholino)ethene
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DOI: 10.1007/s10593-018-2211-4
Abstract: The reaction of 1,1-bis(morpholino)ethene with precursors of о-quinone methides derived from Mannich bases of phenols and 2-naphthols provided a series of chromeno[2,3-b]chromenes. The cascade process included a hetero-Diels–Alder reaction between о-quinone methide and ketenaminal, elimination… read more here.
Keywords: quinone methides; quinone; morpholino ethene; bis morpholino ... See more keywords