P(RNCH2CH2)3N: an efficient promoter for the synthesis of 3-substituted coumarins was written by Kisanga, Philip;Fei, Xiangshu;Verkade, John. And the article was included in Synthetic Communications in 2002.Synthetic Route of C14H14N2O2 This article mentions the following:
The title compounds wherein R = Me or i-Pr function as efficient promoters for the formation of coumarins in good to excellent yields (80-95%) from salicylaldehydes and di-activated methylene compounds of the type R’CH2CO2Et (R’ = CO2Et, COMe, CN). Although the yields are not generally superior to those reported in the literature, the methodol. applied here is more convenient in that milder conditions and shorter reaction times are facilitated by the use of the aforementioned com. available catalysts. In the experiment, the researchers used many compounds, for example, 7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6Synthetic Route of C14H14N2O2).
7-(Diethylamino)-2-oxo-2H-chromene-3-carbonitrile (cas: 51473-74-6) belongs to nitriles. Nitrile carbon shifts are in the range of 115–125 ppm whereas in isonitriles the shifts are around 155–165 ppm. In addition, Nitriles can react with alkynes, which leads to an increase in carbon chain length (carbocyanation).Synthetic Route of C14H14N2O2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts