Photoredox-Induced Three-Component Oxy-, Amino-, and Carbotrifluoromethylation of Enecarbamates
摘要:
A photoredox-catalzyed trifluoromethylation of enecarbamates process is reported. This pathway uses Togni's reagent as the CF3 source and follows a radical/cationic pathway. Under the optimized conditions using [Ru(bpy)(3)(PF6)(2)] as the photocatalyst, a wide range of substituted enecarbamates can readily be difunctionalized by means of various O, N, and C nudeophiles.
Photoredox-Induced Three-Component Oxy-, Amino-, and Carbotrifluoromethylation of Enecarbamates
摘要:
A photoredox-catalzyed trifluoromethylation of enecarbamates process is reported. This pathway uses Togni's reagent as the CF3 source and follows a radical/cationic pathway. Under the optimized conditions using [Ru(bpy)(3)(PF6)(2)] as the photocatalyst, a wide range of substituted enecarbamates can readily be difunctionalized by means of various O, N, and C nudeophiles.
Asymmetric [3 + 2] cycloaddition of quinones with ene- and thioene-carbamates was achieved by chiral phosphoric acid catalysis, providing the corresponding 3-amino-2,3-dihydrobenzofurans in excellent yields with moderate to good diastereoselectivities and excellent enantioselectivities. An asymmetric tandem oxidative cycloaddition protocol starting from hydroquinones was also accomplished with phenyliodine(III)
Iron Chloride‐Catalyzed Three‐Component Domino Sequences: Syntheses of Functionalized α‐Oxy‐<i>N</i>‐acylhemiaminals and α‐Oxyimides
作者:Fleur Drouet、Jieping Zhu、Géraldine Masson
DOI:10.1002/adsc.201300847
日期:2013.12.16
AbstractThe iron(III) chloride‐multicatalyzed dioxygenation of enamides with TEMPO in the presence of alcohols has been developed. This multicomponent domino process affords efficient new strategies for the synthesis of α‐oxy‐N‐acylhemiaminals or α‐oxyimides in good to excellent yields under mild conditions.magnified image