Acetic Acid → Methyl 4-(2-chloroethoxy)-5-methoxy-2-nitrobenzoate

HRID 384768Notes

Reaction equation

[Cl:1][CH2:2][CH2:3][O:4][C:5]1[CH:14]=[CH:13][C:8]([C:9]([O:11][CH3:12])=[O:10])=[CH:7][C:6]=1[O:15][CH3:16].[N:17]([O-:19])=[O:18].[Na+].C(O)(=O)C.[N+]([O-])(O)=O>O>[Cl:1][CH2:2][CH2:3][O:4][C:5]1[C:6]([O:15][CH3:16])=[CH:7][C:8]([C:9]([O:11][CH3:12])=[O:10])=[C:13]([N+:17]([O-:19])=[O:18])[CH:14]=1

Participants

Conditions

Temperature: 40 °C

Procedure

In a 50 mL volume glass flask equipped with a stirrer, a thermometer and a dropping funnel were placed 1.02 g (4.09 mmol) of methyl 4-(2-chloroethoxy)-3-methoxybenzoate (purity: 98%) obtained in Example II-1, 0.03 g (0.40 mmol) of sodium nitrite, and 1.25 mL of acetic acid. The resulting mixture was heated to 40° C. under stirring. To the reaction mixture was dropwise added slowly 1.72 g (16.5 mmol) of nitric acid (60 wt. %), and the mixture was heated at 40-50° C. for 5 hours. After the reaction was complete, 5 mL of water was added to the reaction mixture, and the aqueous mixture was cooled to 20° C., precipitating a crystalline product. The crystalline product was collected by filtration and dried under reduced pressure, to give 1.12 g (isolated yield: 93.0%, purity: 98% in terms of area percentage determined by high performance liquid chromatography) of methyl 4-(2-chloroethoxy)-5-methoxy-2-nitrobenzoate as a white crystalline product.

Workup

customIn a 50 mL volume glass flask equipped with a stirrer
temperaturethe mixture was heated at 40-50° C. for 5 hours
temperaturethe aqueous mixture was cooled to 20° C.
customprecipitating a crystalline product
filtrationThe crystalline product was collected by filtration
customdried under reduced pressure

Sources & evidence

ORD record: ord-f70a35901acd4a6fbd5d8230fa647008
Source dataset: uspto-grants-2013_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08367824B2

Reaction notes

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