Sodium Thiosulfate → Methyl 5-bromo-4-cyclopropyl-2-isopropoxybenzoate

HRID 531026Notes

Reaction equation

[Br:1]N1C(=O)NC(=O)N(Br)C1=O.[CH:12]1([C:15]2[CH:24]=[CH:23][C:18]([C:19]([O:21][CH3:22])=[O:20])=[C:17]([O:25][CH:26]([CH3:28])[CH3:27])[CH:16]=2)[CH2:14][CH2:13]1.S([O-])([O-])(=O)=S.[Na+].[Na+]>CN(C=O)C>[Br:1][C:24]1[C:15]([CH:12]2[CH2:14][CH2:13]2)=[CH:16][C:17]([O:25][CH:26]([CH3:28])[CH3:27])=[C:18]([CH:23]=1)[C:19]([O:21][CH3:22])=[O:20]

Participants

Conditions

Temperature: 90 °C

Procedure

Dibromoisocyanuric acid (3.99 g) was added at room temperature to a DMF (80 mL) solution of methyl 4-cyclopropyl-2-isopropoxybenzoate (5.43 g), and the mixture was stirred at 90° C. for 1 hour in a nitrogen atmosphere. An aqueous sodium thiosulfate solution was added to the reaction mixture at room temperature, followed by extraction with ethyl acetate. The obtained organic layer was washed with water and saturated saline in this order and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate) to obtain the title compound (6.89 g).

Workup

extractionfollowed by extraction with ethyl acetate
washThe obtained organic layer was washed with water and saturated saline in this order
dry with materialdried over anhydrous magnesium sulfate
distillationthe solvent was distilled off under reduced pressure
customThe obtained residue was purified by silica gel column chromatography (hexane/ethyl acetate)

Sources & evidence

ORD record: ord-bb46b8ec3cdb4ed89c25df30a230dc26
Source dataset: uspto-grants-2016_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09353108B2

Reaction notes

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