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ChemicalBook CAS DataBase List 6-Hydroxy-7-methoxy-3,4-dihydroquinazolin-4-one
179688-52-9

6-Hydroxy-7-methoxy-3,4-dihydroquinazolin-4-one synthesis

8synthesis methods
-

Yield:179688-52-9 94%

Reaction Conditions:

with methanesulfonic acid;L-methionine at 100; for 22 h;

Steps:

1.1-2
( 1 -2) 6-hydroxy-7-methoxyquinazolin-4(3H)-one; 3.06 g of the compound obtained in (1-1) was diluted with 20 mi of methanesulfonic acid. 2.66 g of /--methionine was added to the resulting solution and stirred at 100 °C for 22 hours. Ice was added to the reaction mixture and neutralized with 40% aqueous sodium hydroxide to induce the crystallization of the product. The solid was filtered under a reduced pressure, washed with water, and air-dried to obtain the title compound (2.67 g, 94%).1H-NMR (300MHz, DMSO-d6) δ 11.94 (s, IH), 9.81 (s, IH), 7.92 (_?, IH), 7.39 (s, IH), 7.11 (s, IH), 3.91 (s, 3H).

References:

HANMI PHARM. CO., LTD. WO2008/150118, 2008, A2 Location in patent:Page/Page column 21

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