from readily available N-arylamides and commercial isocyanates was developed. This one-pot procedure involves the chemoselective activation of the secondary amide with Tf2O/2-Br-Pyr, the sequential addition of isocyanate, and cyclization. The mild reaction is general for a wide range of substrates and can be run on a gram scale.
开发了一种从容易获得的N-芳基酰胺和市售异氰酸酯制备2,3-二烷基取代的喹唑啉酮的简便方法。此一锅法涉及用Tf 2 O / 2-Br-Pyr对仲酰胺进行化学选择性活化,依次添加异氰酸酯和环化反应。温和的反应通常适用于多种底物,并且可以克量级进行。