Related Products of 91476-80-1, These common heterocyclic compound, 91476-80-1, name is 5,6,7,8-Tetrahydroimidazo[1,2-a]pyrazine, 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.
(6) A mixture of whole amount of 4-(3-chloro-4-methoxybenzylamino)-5-methoxycarbonyl-6-(4-hydroxypiperidin-1-yl)-2-methylsulfinylpyrimidine (prepared in the above (5)), 5,6,7,8-tetrahydroimidazo[1,2-a]pyrazine 73 mg, triethylamine 0.083 ml and N,N-dimethylacetamide 4 ml is stirred at 110 C. for 4 hours. After cooling the reaction mixture is diluted with a 10% aqueous citric acid solution and washed with ethyl acetate. The organic layer is extracted with a 10% aqueous citric acid solution. The water layer is made basic with sodium hydrogen carbonate and extracted with ethyl acetate. The ethyl acetate layer is washed, dried and concentrated in vacuo. The residue is separated with silica gel chromatography (solvent; chloroform_methanol=100:1?50:1), and then crystallized from a mixture of ethyl acetate, methanol and isopropyl ether to give 4-(3-chloro-4-methoxybenzylamino)-5-methoxycarbonyl-6-(4-hydroxypiperidin-1-yl)-2-(5,6,7,8-tetrahydroimidazo[1,2-a]pyrazin-7-yl)pyrimidine as a colorless crystalline powder 20 mg. mp 179-180 C. IR (Nujol)cm-1: 3380, 3181, 1664, 1572, 1533, 1463 APCI-MS(m/z): 528(M+H)+
The synthetic route of 91476-80-1 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Yamada, Koichiro; Matsuki, Kenji; Omori, Kenji; Kikkawa, Kohei; US2004/142930; (2004); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem