Samarium(II)-mediated spirocyclization by intramolecularaddition of arylradicals onto an aromatic ring was achieved by the reaction of N-(2-iodophenyl)-N-alkylbenzamides with SmI2 in the presence of HMPA, yielding spirocyclic indolin-2-one derivatives. The ether congeners afford spirocyclic benzofuran derivatives in moderate yields by arylradicaladdition onto a benzene ring without having an electron-withdrawing
Synthesis of Aminated Phenanthridinones via Palladium/Norbornene Catalysis
作者:Xavier Abel-Snape、Andrew Whyte、Mark Lautens
DOI:10.1021/acs.orglett.0c02850
日期:2020.10.16
An ortho-amination, ipso-C–H arylation mediated by palladium/norbornene cooperative catalysis is reported. This reaction proceeds through a sequential intermolecular C–N bond formation process followed by intramolecular C–H activation of a tethered arene. The products, aminated phenanthridinones, were generated in moderate to good yields. This method is also applicable to the formation of dibenzazepinones
Radical Cyclization Approach to Spirocyclohexadienones
作者:Felix González-López de Turiso、Dennis P. Curran
DOI:10.1021/ol0477226
日期:2005.1.1
Cyclization of an aryl radical at the ipso position of a p-O-aryl-substituted acetamide or benzamide generates oxindoles or quinolones bearing spirocyclohexadienone rings. This versatile reaction is applied to formal syntheses of the vasopressin inhibitor SR121463A and aza-galanthamine.