Abstract
Oxidative coupling of 4α,9-diaza-1,2,4α,9α-tetrahydro-9H-fluorenes with o-aminophenol and o-aminothiophenol in the presence of MnO2 gives o-hydroxyphenyl- and o-mercaptophenylquinonediimines, cyclization of which gives derivatives of phenoxazine and phenothiazine.
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Slabko, O.Y., Ageenko, N.V., Verbitski, G.A. et al. Oxidative Coupling of 4α,9-Diaza-1,2,4α,9α-tetrahydrofluorenes. 5. Reaction with o-Aminophenol and o-Aminothiophenol. Chemistry of Heterocyclic Compounds 38, 226–230 (2002). https://doi.org/10.1023/A:1015351628312
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DOI: https://doi.org/10.1023/A:1015351628312