Synthesis of N,N-dialkylaminobenzonitriles and halo-(N,N-dialkyl)benzamidines by reaction of halobenzonitriles with lithium amides
作者:Paola Vitale、Leonardo Di Nunno、Antonio Scilimati
DOI:10.1016/j.tet.2011.06.066
日期:2011.9
3- and 4-N,N-Dialkylaminobenzonitriles and 4-chloro-(N,N-dialkyl)benzamidines were isolated by reacting 4-chlorobenzonitrile with hindered lithium amides under thermodynamic (0 degrees C) and kinetic control conditions (-78 degrees C), respectively. As previously reported, a benzyne mechanism seems to be confirmed since N,N-dialkylaminobenzonitriles are formed. Only benzamidines were isolated in fair to high yields at both 0 degrees C and -78 degrees C with non-hindered lithium amides. Exploitation and mechanistic rationale of the reaction of different halobenzonitriles are also reported. (C) 2011 Elsevier Ltd. All rights reserved.