Initially discovered in 1867 by Gautier 1 and Hofmann 2 , isonitriles have emerged as a synthetically useful class of organic compounds. A number of important isonitrile-based methods had been developed, including the Passerini reaction 3 and the Ugi 4-component coupling reaction, 4 among others. 5 We recently reported a novel thermally induced two-component coupling reaction between isonitriles and carboxylic acids, which provides ready access to various N-formyl ...