58487-62-0Relevant articles and documents
SYNTHESIS OF N-ACETYL-N'-ARYL(HETERYL)UREAS FROM N-(1-HYDROXYIMINO-2-OXOPROPYL)PYRIDINIUM CHLORIDE
Poplavskaya, I. A.,Aubakirova, G. B.,Kurmangalieva, R. G.
, p. 425 - 431 (2007/10/03)
N-Acetyl-N'-aryl(heteryl)ureas were synthesized by reaction of N-(1-hydroxyimino-2-oxopropyl)pyridinium chloride with amines.The use of amines on a silica support considerably increases the yield of acetylureas.
Central Nervous System Active Compounds. XIV On the Cyclization of N-Acyl-N'-arylureas
Heinicke, Grant,Hung, Tran V.,Prager, Rolf H.,Ward, A. David
, p. 831 - 844 (2007/10/02)
The cyclization of N-acyl-N'-arylureas in polyphosphoric acid has been reinvestigated.The product is not only the 4-substituted quinazolin-2(1H)-one as reported, but also contains the 2-acylaniline in major proportions.Two minor products have also been isolated.At 80 deg, an intermediate has been detected, the properties of which are consistent with it being the corresponding 2-acylphenylurea.Acyl ureas with strongly electron-withdrawing acyl groups from major amount of the corresponding anilide by the formal loss of cyanic acid.The application of this reaction tothe synthesis of quinazolinylphthalides has been investigated.
