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- W2082680154 abstract "Two new synthetic routes to pyrido [4,3-b]carbazoles are described. In the first, Goldberg-type coupling of various aryl sulfonamides with aryl bromides in the presence of copper and potassium carbonate gives N,N-diaryl sulfonamides. UV irradiation of these, in ethanol, removes the toluene-p-sulfonyl protecting groups and cyclises the diphenylamine moiety to the corresponding carbazoles. These carbazoles are established intermediates in the synthesis of several ellipticines (5,11 -dimethyl-pyrido[4,3-b]carbazoles)." @default.
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- W2082680154 date "1992-01-01" @default.
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- W2082680154 title "The synthesis of pyrido [4,3-b]carbazoles from diphenylamine derivatives: alternative routes to and relay syntheses of ellipticines and olivacines" @default.
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- W2082680154 doi "https://doi.org/10.1039/p19920003439" @default.
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