Synthesis of 3-cyanocoumarins was written by Czerney, P.;Hartmann, H.. And the article was included in Journal fuer Praktische Chemie (Leipzig) in 1981.Electric Literature of C14H14N2O2 This article mentions the following:
The cyanocoumarins I (R = H, 6-Br, 8-MeO, 7-Me2N, 7-Et2N, 7-pyrrolidino, 5,6-benzo) were prepared by cyclization of the benzaldehydes II with H2NCOCH2CN to give the coumarincarboxamides III, which were treated with POCl3-DMF and then hydrolyzed. In the experiment, the researchers used many compounds, for example, 7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6Electric Literature of C14H14N2O2).
7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6) belongs to nitriles. Nitrile function is a very important functional group because it can be manipulated to other functional groups such as carboxylic acid by hydrolysis or amine by reduction, respectively. In addition, Nitriles can react with alkynes, which leads to an increase in carbon chain length (carbocyanation).Electric Literature of C14H14N2O2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts