Facile Synthesis of Sterically Hindered and Electron-Deficient Secondary Amides from Isocyanates
作者:Gabriel Schäfer、Coraline Matthey、Jeffrey W. Bode
DOI:10.1002/anie.201204481
日期:2012.9.3
The big easy: The direct coupling of Grignard reagents to isocyanates provides a facile and robust solution for the synthesis of sterically hindered and electron‐deficient secondary amides. The products are obtained in high yields without the need for excess reagents or chromatographic purification.
Highly hindered and sensitive isocyanates react with alcohols under mild catalysis by titanium tetra-t-butoxide to give high yields of the corresponding carbamates.