Dihydroxybenzamide derivatives having anti-inflammatory activity
申请人:KUREHA KAGAKU KOGYO KABUSHIKI KAISHA
公开号:EP0142241A1
公开(公告)日:1985-05-22
Dihydroxybenzamide derivatives, having anti-inflammatory activity and therefore useful in medecine, are represented by the formula (I):
wherein R' represents hydrogen or alkyl of 1 to 4 carbon atoms and R2 represents straight chain-alkyl of 4 to 12 carbon atoms, branched chain-alkyl of 4 to 12 carbon atoms, cyclo- alkyl of 4 to 12 carbon atoms,
wherein n is an integer of 1 to 6, or substituted or unsubstituted pyridyl, or R' and R2 together with the nitrogen atom to which they are attached represent a group of the formula -N-X-Y wherein X represents nitrogen or methine and Y represents hydrogen, alkyl of 1 to 6 carbon atoms or phenyl.
We describe iron‐catalyzed oxidativecouplingcyclization of tetrahydrocarbazoles or THβCs or THγCs to form benzofuroindolenines as fused polycyclic indoles. This mild, efficient and simple approach afforded a library of more than 52 complex compounds across a range of substrate classes with good to excellent yields.