Synthesis of Tertiary Amides from Anionically Activated Aromatic Trifluoromethyl Groups
作者:Gavin O’Mahony、Andrew K. Pitts
DOI:10.1021/ol100507n
日期:2010.5.7
In this paper, a novel synthesis of tertiary amides from anionically activated aromatic trifluoromethyl groups is presented. Anionically activated trifluoromethyl groups react with secondary amines under aqueous conditions to afford tertiary amides. The mechanism involves initial elimination of hydrogen fluoride by an E1cB mechanism to afford an electrophilic quinone methide- or azafulvene-type intermediate
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
The synthesis of spirooxindoles with a hypervalent iodine reagent depended on N-substituted benzanilide derivatives as starting materials. Reaction yields of benzanilides containing various N-substituents were discovered to relate to the cis and trans conformations of the amide bond by ab initio molecular orbital calculations at the B3LYP/6-31G(d,p) and MP2/6-31G(d,p) levels, including full geometry optimizations. The relationship between the reaction and conformation of the starting material by quantum chemical calculations was applied to the formal synthesis of SR121463.