Chlorosuccinimide → 4-bromo-5-(4-chloro-1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxylic Acid

HRID 2392147Notes

Reaction equation

[Cl:1]N1C(=O)CCC1=O.[Br:9][C:10]1[CH:11]=[C:12]([C:21]([OH:23])=[O:22])[S:13][C:14]=1[C:15]1[N:19]([CH3:20])[N:18]=[CH:17][CH:16]=1>O1CCCC1>[Br:9][C:10]1[CH:11]=[C:12]([C:21]([OH:23])=[O:22])[S:13][C:14]=1[C:15]1[N:19]([CH3:20])[N:18]=[CH:17][C:16]=1[Cl:1]

Participants

Conditions

Temperature: 70 °C

Procedure

N-chlorosuccinimide (NCS) (299 mg, 2.194 mmol) was added in portions to a 30 mL sealed tube reactor containing 4-bromo-5-(1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxylic acid (503 mg, 1.23 mmol) in tetrahydrofuran (THF) (6 mL) at room temperature. The mixture was heated to 70° C. for 2 hours. Upon completion, the reaction mixture was partitioned between CHCl3 and H2O, the organic layer dried with Na2SO4, solvents removed by vacuum distillation affording the title compound (0.54 mg, quant.) which was used without further purification. LC-MS (ES) m/z=321 (M+H)+

Workup

customsealed tube reactor
customUpon completion, the reaction mixture was partitioned between CHCl3 and H2O
dry with materialthe organic layer dried with Na2SO4, solvents
customremoved by vacuum distillation

Sources & evidence

ORD record: ord-b8e8c0901ad8457ca579ba2c582a3deb
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08273782B2

Reaction notes

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