Radical Cyclization Approach to Spirocyclohexadienones
摘要:
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.
Iodobenzene-Mediated Intramolecular Oxidative Coupling of Substituted 4-Hydroxyphenyl-N-phenylbenzamides for the Synthesis of Spirooxindoles
作者:Wei Yu、Zhengsen Yu、Xuhui Ju、Junyan Wang
DOI:10.1055/s-0030-1259444
日期:2011.3
effect the intramolecularoxidativecoupling of substituted 4-hydroxyphenyl-N-phenylbenzamides. The transformations could be realized in a catalytic manner by using iodobenzene as catalyst and m-chloroperoxybenzoic acid or urea˙H2O2 as terminal oxidant. This reaction constitutes an efficient method for the synthesis of spirooxindoles. hypervalent iodine - oxidativecoupling - phenolic coupling - spirooxindoles