Catalytic asymmetric carbonyl-ene reactions with alkynylogous and vinylogous glyoxylates: Application to controlled synthesis of chiral isocarbacyclin analogues
The asymmetriccarbonyl-enereaction with alkynylogous and vinylogous glyoxylates (I, 2) catalyzed by a binaphthol-derivedchiraltitaniumcomplex is described. The catalytic asymmetric ene reaction with aldehyde (1) can be applied to the double asymmetric synthesis of isocarbacyclin analogues bearing a 2-allenyl side chain.