Some common heterocyclic compound, 33332-25-1, name is Methyl 5-chloropyrazine-2-carboxylate, molecular formula is C6H5ClN2O2, 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. Recommanded Product: Methyl 5-chloropyrazine-2-carboxylate
Example 190C methyl 5-ethenylpyrazine-2-carboxylate (1430) A solution of methyl 5-chloropyrazine-2-carboxylate (3 g, 17.38 mmol), potassium vinyltrifluoroborate (5.12 g, 38.2 mmol) and 1,1?-bis(diphenylphosphino)ferrocenedichloro palladium(II) dichloromethane complex (1.272 g, 1.738 mmol) in isopropyl alcohol (45 mL, anhydrous) was treated with triethylamine (4.85 mL, 34.8 mmol) and the atmosphere was vacuum purged with N2 a few times. The mixture was heated at 80 C. under N2 for 2 hours and cooled. The mixture was partitoned between saturated aqueous NaHCO3 solution (50 mL) and ethyl acetate (150 mL). The layers were separated and the aqueous layer was extracted with ethyl acetate (2×50 mL). The combined ethyl acetate layers were washed with brine, dried (MgSO4), filtered, and concentrated. The residue was chromatographed on silica gel eluting with a gradient of 25 to 100% ethyl acetate in heptanes to provide the title compound (2.28 g, 13.89 mmol, 80% yield)1H NMR (400 MHz, CDCl3) delta 9.23 (d, J=1.0 Hz, 1H), 8.67 (d, J=1.1 Hz, 1H), 6.89 (dd, J=17.4, 10.8 Hz, 1H), 6.51 (d, J=17.4 Hz, 1H), 5.78 (d, J=10.9 Hz, 1H), 4.03 (s, 3H); LC/MS (ESI+) m/z 165 (M+H)+.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 33332-25-1, its application will become more common.
Reference:
Patent; AbbVie S.a.r.l.; Galapagos NV; Altenbach, Robert J.; Bogdan, Andrew; Cowart, Marlon D.; Esmieu, William Ramesh; Gfesser, Gregory A.; Greszler, Stephen N.; Koenig, John R.; Kym, Philip R.; Liu, Bo; Malagu, Karine Fabienne; Patel, Sachin V.; Scanio, Marc J.; Searle, Xenia B.; Voight, Eric; Wang, Xeuqing; Yeung, Ming C.; (202 pag.)US2017/15675; (2017); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem