Thionyl Chloride → 5-Amino-3-cyano-1-(6-fluoro-1,1,3,3-tetrafluoro-1,3-dihydroisobenzofuran-5-yl)-4-trifluoromethylsulfenylpyrazole

HRID 1871564Notes

Reaction equation

[NH2:1][C:2]1[N:6]([C:7]2[CH:8]=[C:9]3[C:13](=[CH:14][C:15]=2[F:16])[C:12]([F:18])([F:17])[O:11][C:10]3([F:20])[F:19])[N:5]=[C:4]([C:21]#[N:22])[CH:3]=1.[F:23][C:24]([F:29])([F:28])[S:25]([O-])=O.[Na+].S(C1C=CC(C)=CC=1)(O)(=O)=O.CNC.S(Cl)(Cl)=O>C1(C)C=CC=CC=1.O>[NH2:1][C:2]1[N:6]([C:7]2[CH:8]=[C:9]3[C:13](=[CH:14][C:15]=2[F:16])[C:12]([F:18])([F:17])[O:11][C:10]3([F:20])[F:19])[N:5]=[C:4]([C:21]#[N:22])[C:3]=1[S:25][C:24]([F:29])([F:28])[F:23]

Participants

Conditions

Temperature: 55 °C

Procedure

To a suspension wherein 5-amino-3-cyano-1-(6-fluoro-1,1,3,3-tetrafluoro-1,3-dihydroisobenzofuran-5-yl)pyrazole (900 mg, 2.85 mmol), sodium trifluoromethanesulfinate (890 mg, 5.70 mmol) and dimethylamine tosylate (1.550 g, 7.13 mmol) are in toluene (5 ml), thionyl chloride (678 mg, 5.70 mmol) was added dropwise under ice cooling over a period of about 10 minutes and stirred at 50 to 60° C. for 10 hours. After allowing time to cool, the reaction solution was poured into water, extracted with ethyl acetate, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was subjected to silica gel column chromatography to give 340 mg of 5-amino-3-cyano-1-(6-fluoro-1,1,3,3-tetrafluoro-1,3-dihydroisobenzofuran-5-yl)-4-trifluoromethylsulfenylpyrazole.

Workup

temperatureto cool
extractionextracted with ethyl acetate
dry with materialthe organic layer was dried over anhydrous magnesium sulfate
distillationThe solvent was distilled off under reduced pressure

Sources & evidence

ORD record: ord-a8f634da22cf492aab7816420f95b482
Source dataset: uspto-grants-2000_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06103750

Reaction notes

Loading…