Radical Rearrangement Reaction of Propargyl Ethers to α,β-Unsaturated Aldehydes via Photoredox and Ni Catalysis

Aryl migration, especially 1,4-aryl migration, is one of the most important reactions in radical rearrangement. Over the past decades, 1,4-aryl migration by the addition of a radical to alkynes has become a simple and efficient method in the difunctionalization reactions of alkynes. Radical-based 1,4-aryl migration of aryl alkynoates has been well-explored; however, the 1,4-aryl migration of aryl propynyl ethers is rarely studied. Herein, we first described radical 1,4-aryl migration of propargyl ether to valuable α,β-unsaturated aldehydes via photoredox and Ni catalysis. This method features redox-neutral conditions, readily available starting materials, broad substrate scope, good functional group compatibility, and diverse transformations. Mechanistic studies suggest that this reaction proceeds through a radical-involved pathway.

Iron-catalyzed hydrogen atom transfer induced cyclization of 1,6-enynes for the synthesis of ketoximes: a combined experimental and computational study

An iron-catalyzed reductive radical cyclization/hydro-oximation of 1,6-enynes with tBuONO was developed, leading to functionalized benzofuran, benzothiophene, and cyclopentenyl-based ketoximes.

Recent advances in 1,4-functional group migration-mediated radical fluoroalkylation of alkenes and alkynes

Recently, the combination of radical fluoroalkylation of alkenyl or alkynyl moieties and 1,4-functional group migration (1,4-FGM) has emerged as a powerful strategy for the synthesis of fluorine-containing compounds. In this article, some representative reactions of 1,4-FGM-mediated radical fluoroalkylation of N-(arylsulfonyl)acrylamides, tertiary alcohol-containing alkynes, tertiary alcohol-containing alkenes and intermolecular 1,4-FGM-type substrates have been discussed based on the types of substrates.