Iron-Catalyzed Oxidative Arylmethylation of Activated Alkenes Using a Peroxide as the Methyl Source
摘要:
A novel, simple route for the synthesis of oxindoles is presented via iron-catalyzed oxidative arylmethylation of activated alkenes with peroxides. This work is realized by the use of a peroxide as the methyl source and 1,4-diazabicyclo[2.2.2]octane as the ligand and represents a new access to oxindoles through an alkene oxidative difunctionalization process.
An FeCl2-promoted carbomethylation of arylacrylamides by di-tert-butyl peroxide (DTBP) is achieved, leading to 3-ethyl-3-substituted indolin-2-one in high yield. The reaction tolerates a series of functional groups, such as cyano, nitro, ethyloxy carbonyl, bromo, chloro, and trifluoromethyl groups. The radical methylation and arylation of the alkenyl group are involved in this reaction.
A free radical‐initiated methylation and/or α‐chloro‐β‐methylation of N‐arylacrylamides with dimethyl sulfoxide under the analogous Fenton reaction condition has been developed, which provides an effective and facile cascade strategy for the synthesis of oxindoles and chlorinated amides.