Transformations of Isonitriles with Bromoalkanes Using Photoredox Gold Catalysis
作者:Samantha Rohe、Terry McCallum、Avery O. Morris、Louis Barriault
DOI:10.1021/acs.joc.8b01380
日期:2018.9.7
Recently, photoredox catalysis has emerged as a powerful tool for the construction of C–C bonds with few protocols for alkylative heterocycle synthesis through isonitrile addition. Herein, we describe the photocatalytic generation of alkyl radicals from unactivated bromoalkanes as part of an efficient cross-coupling strategy for the diversification of isonitriles using a dimericgold(I) photoredox catalyst
photocatalytic protocol enabling the formation of secondary amides from electron-poor organic bromides and isocyanides was developed. In addition, the in situ interception of ketenimine intermediates with nitrogen nucleophiles such as amines, hydrazines, and TMSN3 afforded, in a one-pot two-step procedure, valuable scaffolds such as ketene aminals, pyrazolones, and tetrazoles. Mechanistic evidence confirmed
We developed a novel synthetic method of carbamoylacetates from alpha-iodoacetate, carbon monoxide, and amines under photoirradiation conditions in the presence of a Pd catalyst. This reaction likely proceeds via interplay of radical and organopalladium species.
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