Novel analgesics and molecular rearrangements in the morphine–thebaine group. Part XI. The base-catalysed rearrangement of dihydrothebainequinone
Abstract
The base-catalysed rearrangement of dihydrothebainequinone (4) proceeds differently from that of nepenthone (1; R = Ph) to give a phenolic diketone (6), hydrolysable to a triketone (7) and further rearranged by base to dihydroflavothebaone enol methyl ether (11).