Dimethyl Sulfoxide → Telmisartan

HRID 2363802Notes

Reaction equation

[CH3:1][CH2:2][CH2:3][C:4]1[NH:12][C:11]2[C:6](=[C:7]([CH3:23])[CH:8]=[C:9]([C:13]3[N:21]([CH3:22])[C:20]4[C:15](=[CH:16][CH:17]=[CH:18][CH:19]=4)[N:14]=3)[CH:10]=2)[N:5]=1.[CH3:24]S(C)=O.[OH-].[K+].C[O:31][C:32]([C:34]1[C:35]([C:42]2[CH:47]=[CH:46][CH:45]=[CH:44][CH:43]=2)=[CH:36][CH:37]=[C:38](CBr)[CH:39]=1)=[O:33]>C(O)(=O)C.O>[CH2:3]([C:4]1[N:12]([CH2:24][C:45]2[CH:44]=[CH:43][C:42]([C:35]3[C:34]([C:32]([OH:31])=[O:33])=[CH:39][CH:38]=[CH:37][CH:36]=3)=[CH:47][CH:46]=2)[C:11]2[CH:10]=[C:9]([C:13]3[N:21]([CH3:22])[C:20]4[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=4[N:14]=3)[CH:8]=[C:7]([CH3:23])[C:6]=2[N:5]=1)[CH2:2][CH3:1]

Participants

Conditions

Temperature: 27.5 °C

Procedure

50 gm of [1H-Benzimidazole-2-n-propyl-4-methyl-6-(1′methyl benzimidazole-2′-yl)] was added to 200 ml dimethyl sulfoxide and 50 gm of potassium hydroxide. To this was added 60 gm of methyl-4-(bromomethyl)biphenyl-2-carboxylate at ambient temperature. The contents were stirred for 2 hours at 25-30° C., then heated to 40-50° C. and maintained for 2 hours. About 500 ml water was added to the reaction mixture at room temperature and acidified to pH 4 with acetic acid. The reaction mixture was filtered and washed with purified water, dried under reduced pressure at 50-60° C. to give 80 gm (88%) of the title product.

Workup

temperatureheated to 40-50° C.
temperaturemaintained for 2 hours
filtrationThe reaction mixture was filtered
washwashed with purified water
customdried under reduced pressure at 50-60° C.

Sources & evidence

ORD record: ord-bce84c84b78b465d807e0b4d2cec07c8
Source dataset: uspto-grants-2014_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08691999B2

Reaction notes

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