Photochemistries of Oxadiazabicyclo[1.2.4]nonadiene, Oxadiazabicyclo[2.2.3]nonadiene, and Oxatriazabicyclo[2.2.3]nonadiene Systems: Cycloreversion Reactions to Generate Azepine or Diazepine Derivatives and Isomerization Reaction of Oxadiazabicyclo[2.2.3]nonadiene Systme to Oxadiazabicyclo[1.2.4]nonadiene System
Regioselective Cycloadditions of 1H-Azepine and 1H-1,2-Diazepine Derivatives with N,a-Diphenylnitrone and Nitrosobenzene
摘要:
Reactions of 1-carbomethoxy-lH-azepine with N, alpha-diphenylnitrone afforded endo- and exo-[2 + 3]-type cycloadducts in almost the same ratio. Reactions of 1-carboethoxy-lH-azepine with nitrosobenzene in chloroform afforded [4 + 2]- and [6 + 2]-types of cycloadducts. Analogous results were obtained in the reactions using 1-carboethoxy-lH-1,2-diazepine.