Carboxylic N,N-diphenylcarbamic anhydrides. New acylating agents was written by Shepard, Kenneth L.;Halczenko, Wasyl. And the article was included in Journal of Heterocyclic Chemistry in 1979.Name: Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate This article mentions the following:
Title anhydrides I and RCO2CONPh2 (R = Ph, 2-furyl, p-HOC6H4, o-, p-H2NC6H4) were prepared by treating carboxylate salts with 1-(N,N-diphenylcarbamoyl)pyridinium chloride in aqueous or ethanolic solution These anhydrides are stable, crystalline derivatives and are very reactive in acylation reactions. These products are more reactive than cyanomethyl esters or the so-called Woodward’s esters, acyloxyacrylamides. In the experiment, the researchers used many compounds, for example, Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate (cas: 1458-01-1Name: Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate).
Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate (cas: 1458-01-1) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.Name: Methyl 3,5-diamino-6-chloropyrazine-2-carboxylate