77464-11-0Relevant academic research and scientific papers
Synthesis and Antiallergy Activity of N--4-aryl-1-piperazinecarboxamide Derivatives
Walsh, David A.,Green, Jerry B.,Franzyshen, Stephen K.,Nolan, Joseph C.,Yanni, John M.
, p. 2028 - 2032 (2007/10/02)
A series of N--4-aryl-1-piperazinecarboxamides was synthesized and evaluated for antiallergy activity.Several derivatives had activity in the passive foot anaphylaxis (PFA) assay, an IgE-mediated model useful in the detection of co
The Dehydration of Ureas by Two-Phase Dichlorocarbene Reaction, a Synthetic Access to Substituted Cyanamides
Schroth, W.,Kluge, H.,Frach, R.,Hodek, W.,Schaedler, H. D.
, p. 787 - 802 (2007/10/02)
A wide variety of N,N-disubstituted ureas are dehydrated in the CHCl3/NaOH catalytic two-phase system under mild conditions.The sequence of urea-transamidation and dehydration thus offers a profitable approach to aprotic cyanamides.Among various tested PT-catalysts tertiary amines prove to be the most efficient and favourable ones.Tertiary amines may also be used advantageously in the transformation of carboxylic amides and thioamides to the corresponding nitriles.The application of the same technique is less suitable in the case of N-mono-substituted ureas, N,N'-disubstituted ureas as well as N(dialkylaminomethylidene)ureas, because consequent reactions of the primarily formed cyanamides predominate.Problems concerning the dehydration mechanism are elucidated in terms of HMO-perturbation theory.
