Tetrahydrofuran → 2-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazole-5-carboxylic acid

HRID 1521421Notes

Reaction equation

C[O:2][C:3]([C:5]1[CH:20]=[CH:19][C:8]2[N:9]([CH2:13][O:14][CH2:15][CH2:16][O:17][CH3:18])[C:10]([Cl:12])=[N:11][C:7]=2[CH:6]=1)=[O:4].C1COCC1.O[Li].O>O>[Cl:12][C:10]1[N:9]([CH2:13][O:14][CH2:15][CH2:16][O:17][CH3:18])[C:8]2[CH:19]=[CH:20][C:5]([C:3]([OH:4])=[O:2])=[CH:6][C:7]=2[N:11]=1

Participants

Conditions

Temperature: 23 °C

Procedure

To a mixture of 2-chloro-1-(2-methoxy-ethoxymethyl)-1H-benzoimidazole-5-carboxylic acid methyl ester (0.600 g, 0.200 mmol), THF (10 mL), and water (3.33 mL), was added LiOH.H2O (47.0 mg, 1.96 mmol). The mixture was stirred 18 h at 23° C. The solvent was evaporated, water (5 mL) was added and the mixture acidified to with 1M HCl. The resulting white precipitate was filtered and dried to yield the titled compound (0.490 g, 86%). MS (ESI/CI): mass calcd. for C12H13ClN2O4, 284.1; m/z found, 285.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6): 12.93 (s, 2H), 8.30 (s, 1H), 8.18 (d, J=1.4 Hz, 1H), 7.96 (dd, J=8.6, 1.5 Hz, 1H), 7.90 (dd, J=8.5, 1.6 Hz, 1H), 7.80 (d, J=8.6 Hz, 1H), 7.71 (d, J=8.5 Hz, 1H), 5.74 (d, J=17.5 Hz, 4H), 3.64-3.60 (m, 4H), 3.43-3.39 (m, 4H), 3.18 (d, J=0.6 Hz, 6H).

Workup

customThe solvent was evaporated
additionwater (5 mL) was added
filtrationThe resulting white precipitate was filtered
customdried

Sources & evidence

ORD record: ord-64570fa5c3f547a8883cf7202f811a28
Source dataset: uspto-grants-2015_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09073923B2

Reaction notes

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