Reference of 116026-95-0 ,Some common heterocyclic compound, 116026-95-0, molecular formula is C11H14N2O3, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc., below Introduce a new synthetic route.
2-oxo-1,2-Dihydro-[1,7]naphthyridine-3-carboxylic Acid Ethyl Ester (6-3) A solution of 6-2 (2.20 g, 9.90 mmol, 1 equiv), diethyl malonate (3.00 mL, 19.8 mmol, 2.00 equiv), and piperidine (0.490 mL, 4.95 mmol, 0.500 equiv) in ethanol (50 mL) was heated at reflux for 20 h. The reaction mixture was allowed to cool to 23 C., then concentrated to about half its volume. The white crystals which formed were filtered and washed with cold ethanol (20 mL) to give 2-oxo-1,2-dihydro-[1,7]naphthyridine-3-carboxylic acid ethyl ester (6-3). 1H NMR (400 MHz, CDCl3) delta 12.15 (br s, 1H), 8.94 (s, 1H), 8.52 (d, 1H, J=5.2 Hz), 8.46 (s, 1H), 7.52 (d, 1H, J=5.2 Hz), 4.48 (q, 2H, J=7.1 Hz), 1.46 (t, 3H, J=7.1 Hz); TLC (EtOAc), Rf=0.13.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route,116026-95-0, its application will become more common.
Reference:
Patent; Merck & Co., Inc.; US6479512; (2002); B1;,
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