Application of 21642-98-8, Adding some certain compound to certain chemical reactions, such as: 21642-98-8, name is 4-Methoxy-2-oxo-1,2-dihydropyridine-3-carbonitrile,molecular formula is C7H6N2O2, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 21642-98-8.
2,4-dichloronicotinonitrile A solution of 5.0 g of commercial 4-methoxy-2-oxo-1,2-dihydropyridine-3-carbonitrile in 50 ml of phosphorus oxychloride is refluxed for 19 hours. After cooling, the reaction medium is poured into a mixture of water and ice. The precipitate formed is filtered off and the filtrate is extracted twice with a 90/10 ethyl acetate/methanol solution. The combined organic phases and the precipitate are dried over magnesium sulfate and then concentrated under reduced pressure to give 6.76 g of a yellowish powder. The crude product is purified on a prepacked Biotage KP-Sil column of 60 A SiO2 32-63 muM (5/95 to 10/90 gradient ethyl acetate in cyclohexane) to give 2.08 g of a white powder of 2,4-dichloronicotinonitrile. MS-IE: 172=[M+] (base peak), 137=[M+]-Cl IR spectrum (KBr): 3072; 2236; 1559; 1539; 1445; 1368; 1220; 1197; 1069; 859; 818; 791 and 416 cm-1 1H NMR spectrum (400 MHz, (CD3)2SO, delta in ppm): 7.92 (d, J=5.5 Hz, 1H); 8.67 (d, J=5.5 Hz, 1H)
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles. 21642-98-8, 4-Methoxy-2-oxo-1,2-dihydropyridine-3-carbonitrile, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; AVENTIS PHARMA S.A.; US2008/39491; (2008); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem