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ChemicalBook CAS DataBase List 1H-Benzimidazole-4-carboxylic acid
46006-36-4

1H-Benzimidazole-4-carboxylic acid synthesis

8synthesis methods
-

Yield: 98%

Reaction Conditions:

at 130;

Steps:

5.1.92.A
A. lH-Benzo[d]imidazole-4-carboxyIic acid.; 2,3-Diaminobenzoic acid (1.0 g, 6.57 mmol) was suspended in triethylorthoformate (20 mL) and heated to 130 0C overnight. Diethyl ether (100 mL) was then added and the resulting precipitate filtered to give a white solid (1.04 g, 6.41 mmol, 98%). 1H NMR (400 MHz, DMSO-rf6) δ 8.22 (s, IH), 7.91 (dd, J = S.0, 1.2, IH), 7.82 (dd, J = 8.0, 1.2, IH), 7.29 (dd, J = 8.0, 7.6, IH); MS (ESI) m/z 163.0 [M+ 1]+.

References:

SIGNAL PHARMACEUTICALS, LLC WO2008/51494, 2008, A1 Location in patent:Page/Page column 132

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