Tetrahydrofuran → 1-(5-benzylsulfanyl-6-chloro-1H-benzoimidazol-2-yl)-1H-pyrazole-4-carboxylic acid

HRID 538153Notes

Reaction equation

C([O:3][C:4]([C:6]1[CH:7]=[N:8][N:9]([C:11]2[NH:15][C:14]3[CH:16]=[C:17]([Cl:28])[C:18]([S:20][CH2:21][C:22]4[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=4)=[CH:19][C:13]=3[N:12]=2)[CH:10]=1)=[O:5])C.C1COCC1.O[Li].O>O>[CH2:21]([S:20][C:18]1[C:17]([Cl:28])=[CH:16][C:14]2[NH:15][C:11]([N:9]3[CH:10]=[C:6]([C:4]([OH:5])=[O:3])[CH:7]=[N:8]3)=[N:12][C:13]=2[CH:19]=1)[C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1

Participants

Conditions

Temperature: 23 °C

Procedure

To a mixture of 1-(5-benzylsulfanyl-6-chloro-1H-benzoimidazol-2-yl)-1H-pyrazole-4-carboxylic acid ethyl ester (0.115 g, 0.256 mmol), THF (4.8 mL), and water (1.2 mL) was added LiOH.H2O (0.107 g, 2.56 mmol). The mixture was stirred for 18 h at 23° C. The solvent was evaporated, water (3 mL) was added and the mixture acidified to pH 3 with 1M HCl. The resulting white precipitate was filtered and dried to yield the titled compound (97.0 mg, 99%). MS (ESI/CI): mass calcd. for C18H13ClN4O2S, 384.0; m/z found, 385.0 [M+H]+. 1H NMR (600 MHz, DMSO-d6): 8.86 (s, 1H), 8.29 (s, 1H), 7.67 (s, 1H), 7.53 (s, 1H), 7.39 (d, J=7.4 Hz, 2H), 7.31 (t, J=7.4 Hz, 2H), 7.25 (t, J=7.1 Hz, 1H), 4.29 (s, 2H).

Workup

customThe solvent was evaporated
additionwater (3 mL) was added
filtrationThe resulting white precipitate was filtered
customdried

Sources & evidence

ORD record: ord-636efb05362e4d5ba440faadadfac35a
Source dataset: uspto-grants-2014_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08865713B2

Reaction notes

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