Cyclization of 2-chloro-3-(1,4-oxocyclohexa-2,5-dienylideneamino)-1,4-dihydronaphthalene-1,4-diones into 6-chloro-10,12a-dihydroxy-7H,12aH-benzo[c]phenoxazin-5-ones
摘要:
2-Chloro-3-(4-oxocyclohexa-2,5-dienylideneamino)-1,4-dihydronaphthalene-1,4-diones maintained in the conc. sulfuric acid undergo cyclization affording in a high yield 6-chloro-10,12a-dihydroqD-7H,12aH-benzo[c]phenoxazin-5-ones whose structure is proved by XRD analysis.
Reactions of 2-(4-hydroxyanilino)-1,4-naphthoquinones with cerium ammonium nitrate and pyridinium chlorochromate
摘要:
Reactions of 2-(4-hydroxyarylamino)-1,4-naphthoquinones with cerium ammonium nitrate or pyridinium chlorochromate depending on the structure of initial substrate and the type of reagent led to the formation of 2-chloro-3-(4-cyclohexa-2,5-dienylideneamino)-1,4-dihydronaphthalene-1,4-diones, 2-(4-hydroxy-3-nitrophenylamino)-1,4-naphthaquinones, and also to simultaneous oxidation and chlorination.