Tandem C/N-Difunctionalization of Nitroarenes: Reductive Amination and Annulation by a Ring Expansion/Contraction Sequence
作者:Gen Li、Marissa N. Lavagnino、Siraj Z. Ali、Shicheng Hu、Alexander T. Radosevich
DOI:10.1021/jacs.2c12450
日期:2023.1.11
A synthetic method for the reductive transformation of nitroarenes into ortho-aminated and -annulated products is reported. The method operates via the exhaustive deoxygenation of nitroarenes by an organophosphorus catalyst and a mild terminal reductant to access aryl nitrenes, which after ring expansion, are trapped by amine nucleophiles to give dearomatized 2-amino-3H-azepines. Treatment of these
Synthesis of polysubstituted azepanes by dearomative ring expansion of nitroarenes
作者:Rory Mykura、Raquel Sánchez-Bento、Esteban Matador、Vincent K. Duong、Ana Varela、Lucrezia Angelini、Rodrigo J. Carbajo、Josep Llaveria、Alessandro Ruffoni、Daniele Leonori
DOI:10.1038/s41557-023-01429-1
日期:——
The synthesis of functionalized nitrogen heterocycles is integral to discovering, manufacturing and evolving high-value materials. The availability of effective strategies for heterocycle synthesis often biases the frequency of specific ring systems over others in the core structures of bioactive leads. For example, while the six- and five-membered piperidine and pyrrolidine are widespread in medicinal