N-Fluorobenzenesulfonimide → 3-Fluoro-5-phenyl-benzo[b]thiophene-2-carboxylic acid

HRID 1023105Notes

Reaction equation

[C:1]1([C:7]2[CH:18]=[CH:17][C:10]3[S:11][C:12]([C:14]([OH:16])=[O:15])=[CH:13][C:9]=3[CH:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Li]CCCC.C1C=CC(S(N(S(C2C=CC=CC=2)(=O)=O)[F:34])(=O)=O)=CC=1>C1COCC1>[F:34][C:13]1[C:9]2[CH:8]=[C:7]([C:1]3[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=3)[CH:18]=[CH:17][C:10]=2[S:11][C:12]=1[C:14]([OH:16])=[O:15]

Participants

Conditions

Temperature: -70 °C

Procedure

To a solution of compound 52c (507 mg, 1.99 mmol) in THF (8 mL) at −70° C. was added n-BuLi (1.6 M in hexane, 2.62 mL, 4.19 mmol). The mixture was stirred at −70° C. for 1 h; then a solution of N-fluorobenzenesulfonimide (817.3 mg, 2.59 mmol) in THF (2 mL) was slowly added. The reaction mixture was allowed to warm to room temperature and was stirred overnight. The resulting mixture was partitioned between dilute aqueous HCl and EtOAc. The organic solution was washed with water and brine, dried over Na2SO4, and concentrated. The residue was triturated from CH2Cl2, filtered and dried the solid to give compound 52d (391.9 mg). MS m/z (M+H+) 273.0.

Workup

temperatureto warm to room temperature
stirringwas stirred overnight
customThe resulting mixture was partitioned between dilute aqueous HCl and EtOAc
washThe organic solution was washed with water and brine
dry with materialdried over Na2SO4
concentrationconcentrated
customThe residue was triturated from CH2Cl2
filtrationfiltered
customdried the solid

Sources & evidence

ORD record: ord-16fb1d3955bd490ab11b9cc552f4972f
Source dataset: uspto-grants-2014_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08722658B2

Reaction notes

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