Studies on organophosphorus compounds 81. A novel synthetic approach to substituted cyclopentane-1,1-diylbisphosphonates via Pd(0) catalyzed enyne cyclization†
Dedicated to Prof. Antonino Fava on the occasion of his seventieth birthday.
Abstract
Intramolecular enyne cycloisomerization reactions catalyzed by Pd(PPh3)4 gave 4-substituted 3-methylenecyclopentane-1,1-diylbisphosphonates in good yield.