The use of silyltriorganostannanes, R3SiSnR'3, in organic synthesis. A novel palladium-catalyzed tandem transmetalation-cyclization reaction
摘要:
The intramolecular coupling of vinyl triflates 12 with vinyl halides proceeded smoothly in the presence of Bu3SnSiMe3 (1a) and a palladium catalyst and gave cyclic products 13 via tandem intermolecular and intramolecular transmetalations.
The use of silyltriorganostannanes, R3SiSnR'3, in organic synthesis. A novel palladium-catalyzed tandem transmetalation-cyclization reaction
摘要:
The intramolecular coupling of vinyl triflates 12 with vinyl halides proceeded smoothly in the presence of Bu3SnSiMe3 (1a) and a palladium catalyst and gave cyclic products 13 via tandem intermolecular and intramolecular transmetalations.
Bu(3)SnH-mediated aryl radicalcyclizationonto methylenecycloalkanes having a phenylthio, an ester, or a nitrile group at the terminus of the alkenic bond provides exclusively exo cyclization products. The results are in sharp contrast to those reported for nonsubstituted methylenecycloalkanes, which give exclusively endo cyclization products. Formation of endo cyclization products has been suggested