1260104-28-6Relevant articles and documents
Synthesis and photochemistry of 3-(o-stilbeneyl)-4-H/Me/Ph-sydnones; Intramolecular cyclization to 1,2-benzodiazepines and/or quinolines
Butkovi?, Kristina,Vuk, Dragana,Marini?, ?eljko,Peni?, Josip,?indler-Kulyk, Marija
experimental part, p. 9356 - 9362 (2011/01/12)
Stilbeneylsydnone derivatives were synthesized by a sequence of reactions in good yields. Irradiation of 3-stilbeneyl-4-methylsydnone 4 gives 1H-1,2-benzodiazepine derivative 7 as the main product along with 2-methylquinoline derivative 20. Irradiation of 3-stilbeneyl-4-phenylsydnone 5 afforded only 1H-1,2-benzodiazepine derivative 8 whereas on irradiation of 4-unsubstituted 3-stilbeneylsydnone 3 no benzodiazepine derivative was detected. An efficient novel photochemical approach to 1H-1,2-benzodiazepines has been found from the new 3-(o-stilbeneyl)-4-substituted-sydnones via intramolecular 1,7-electrocyclization reaction of the photogenerated nitrile imines.