Synthesis of unsymmetrical urea from aryl- or pyridyl carboxamides and aminopyridines using PhI(OAc)<sub>2</sub><i>via in situ</i> formation of aryl- or pyridyl isocyanates
作者:Joydev K. Laha、Neha Singh、Mandeep Kaur Hunjan
DOI:10.1039/d1nj03160k
日期:——
previously, attempts have been made to trap the isocyanates. While the three pyridylisocyanates were trapped as their corresponding carbamates, 3-pyridylisocyanate was isolated and characterized. Unlike closely related previous methods reported for urea synthesis, the current method avoids direct use of isocyanates or eliminates the use of toxic phosgene for the in situ generation of isocyanates.