p-Toluenesulfonic acid → 5-(5-Chlorobenzoxazol-2-yl)-1-(3,3,3-trifluoropropyl)benzimidazole

HRID 74320Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:9][C:8]([C:10]3[CH:11]=[CH:12][C:13]([NH:17][CH2:18][CH2:19][C:20]([F:23])([F:22])[F:21])=[C:14]([CH:16]=3)[NH2:15])=[N:7][C:6]=2[CH:24]=1.[C:25]1(C)C=CC(S(O)(=O)=O)=CC=1.C(=O)([O-])O.[Na+]>C(OCC)(OCC)OCC>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[O:9][C:8]([C:10]3[CH:11]=[CH:12][C:13]4[N:17]([CH2:18][CH2:19][C:20]([F:21])([F:23])[F:22])[CH:25]=[N:15][C:14]=4[CH:16]=3)=[N:7][C:6]=2[CH:24]=1

Participants

Conditions

Temperature: 100 °C

Procedure

To a solution of 5-chloro-2-(2-(3,3,3-trifluoropropyl)aminoanilin-5-yl)benzoxazole (see Working Example 138-1) (200 mg, 0.562 mmol) in triethyl orthoformate (5 mL) was added p-toluenesulfonic acid (10 mg), and this was stirred at 100° C. for 4 hours. After the reaction was complete, saturated aqueous sodium hydrogen carbonate solution was added, and this was extracted with chloroform. The organic layer obtained was dried over anhydrous sodium sulfate, filtered, and concentrated to give crude crystals that were washed with diethyl ether and ethyl acetate to yield the title compound (127 mg, 62% yield) as light yellow crystals.

Workup

extractionthis was extracted with chloroform
customThe organic layer obtained
dry with materialwas dried over anhydrous sodium sulfate
filtrationfiltered
concentrationconcentrated
customto give crude crystals that
washwere washed with diethyl ether and ethyl acetate

Sources & evidence

ORD record: ord-2833ca671160462685176534e65d63e7
Source dataset: uspto-grants-2014_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08829035B2

Reaction notes

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