Dimethylformamide → 6-(3,5-dimethylisoxazol-4-yl)-4-(2,2,3,3,3-pentafluoro-1-hydroxypropyl)-1H-benzo[d]imidazol-2(3H)-one

HRID 1773751Notes

Reaction equation

[CH3:1][C:2]1[C:6]([C:7]2[CH:8]=[C:9]([CH:26]=[O:27])[C:10]3[N:14]=[C:13]([O:15]CC)[N:12](C(OC(C)(C)C)=O)[C:11]=3[CH:25]=2)=[C:5]([CH3:28])[O:4][N:3]=1.[F:29][C:30]([F:36])([F:35])[C:31]([F:34])([F:33])I.CN(C=O)C.CN(C(N(C)C)=C(N(C)C)N(C)C)C>C(OCC)(=O)C>[CH3:1][C:2]1[C:6]([C:7]2[CH:8]=[C:9]([CH:26]([OH:27])[C:31]([F:34])([F:33])[C:30]([F:36])([F:35])[F:29])[C:10]3[NH:14][C:13](=[O:15])[NH:12][C:11]=3[CH:25]=2)=[C:5]([CH3:28])[O:4][N:3]=1

Participants

Conditions

Temperature: 70 °C

Procedure

A solution of tert-butyl 6-(3,5-dimethylisoxazol-4-yl)-2-ethoxy-4-formyl-1H-benzo[d]imidazole-1-carboxylate (100 mg, 0.26 mmol), pentafluoroiodoethane (350 mg, 1.42 mmol) and DMF was cooled to −15° C. under nitrogen. Tetra(dimethlamino)ethylene was added (0.33 mL, 1.42 mmol) and the reaction mixture was irradiated with a sun lamp. A thick precipitate formed, and after 30 minutes, the reaction mixture was diluted with ethyl acetate filtered. The filtrate was washed with water and the organic layer was concentrated and dissolved in ethanol (3 mL) and 4M HCl in dioxane (1 mL) and heated to 70° C. for 1 h. The reaction mixture was concentrated and purified by reverse-phase HPLC to give the desired product as a white powder.

Workup

customthe reaction mixture was irradiated with a sun lamp
customA thick precipitate formed
filtrationfiltered
washThe filtrate was washed with water
concentrationthe organic layer was concentrated
dissolutiondissolved in ethanol (3 mL)
concentrationThe reaction mixture was concentrated
custompurified by reverse-phase HPLC

Sources & evidence

ORD record: ord-b0fe71680ae7432a81ccc0289a35d844
Source dataset: uspto-grants-2016_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09255089B2

Reaction notes

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