Oxa-[3+3] annulation of 1H-benzo[f]chromene-2-carbaldehydes and 2-naphthols: synthesis of 7aH,15H-benzo[f]benzo[5,6]chromeno[2,3-b]chromenes

Chemistry of Heterocyclic Compounds - A method for the preparation of polycondensed chromeno[2,3-b]chromenes was developed based on the formal [3+3] cycloaddition reaction between...     

Reaction of nitroso chlorides of the adamantane series with nucleophiles

Russian Chemical Bulletin - Reactions of nitroso chlorides of 2-alkylydene adamantanes with O- and N-nucleophiles resulted in α-substituted oximes of the adamantane series. Reaction involved...     

Reductive rearrangement of 2-aroyl-2,3-dihydrobenzofurans into 2-hydroxydihydrochalcones and flav-2-enes

Chemistry of Heterocyclic Compounds - A two-step procedure was proposed for the synthesis of 2-aryl- and 2,4-diaryl-substituted 4H-chromenes by the formal [4+1] cycloaddition reaction of o-quinone...     

Synthesis of the new heterocyclic system,indolo[2,1-<Emphasis Type="Italic">b</Emphasis>]benzoxazine

The previously unknown heterocyclic system, indolo[2,1-b][1,3]benzoxazine, has been synthesized by condensation of iodomethylates of 2-[(dimethylamino)methylphenols] and 2-bromomelatonins. The highly reactive o-methylenequinone is proposed as an intermediate.     

Synthesis of naphtho[1,2-<Emphasis Type="Italic">e</Emphasis>]-pyrazolo[5,1-<Emphasis Type="Italic">b</Emphasis>][1,3]oxazines

The previously unknown heterocyclic system naphtho[1,2-e]pyrazolo[5,1-b][1,3]oxazine was synthesized by the condensation of 1-dimethylaminomethyl-2-naphthols with bromopyrazoles. It is proposed that the highly reactive o-methylenequinone of the naphthalene series is formed as an intermediate.