Hydrochloric Acid → 6-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid

HRID 1911666Notes

Reaction equation

HRID 1911666 reaction equation
C[O:2][C:3](=[O:24])[C:4]1[CH:9]=[CH:8][C:7]([O:10][CH2:11][C:12]2[C:13]([C:17]3[CH:22]=[CH:21][C:20]([Cl:23])=[CH:19][CH:18]=3)=[N:14][O:15][CH:16]=2)=[N:6][CH:5]=1.O.[OH-].[Li+].Cl>C1COCC1.CO.O>[Cl:23][C:20]1[CH:19]=[CH:18][C:17]([C:13]2[C:12]([CH2:11][O:10][C:7]3[CH:8]=[CH:9][C:4]([C:3]([OH:24])=[O:2])=[CH:5][N:6]=3)=[CH:16][O:15][N:14]=2)=[CH:22][CH:21]=1

Participants

7

Reactant 3

HCID 313Hydrochloric AcidHCID 168937Lithium hydroxide, monohydrateHCID 684427396-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid methyl ester

Product 1

HCID 684437696-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acidYield 100%

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a suspension of sodium hydride (55% dispersion in mineral oil, 1.16 g, 26.5 mmol) in THF (30 mL) was added a solution of [3-(4-chloro-phenyl)-isoxazol-4-yl]-methanol (24.1 mmol) in THF (60 mL) at 0° C. and the reaction mixture warmed to room temperature over 30 min. Then a solution of methyl 6-chloronicotinate (4.65 g, 26.5 mmol) in THF (60 mL) was added dropwise at 0° C. and the reaction mixture was stirred at room temperature for 2 h. The reaction mixture was then poured into aqueous sodium chloride (saturated) and the mixture was extracted with ethyl acetate. The combined organic layers were then washed with water and brine and then dried over sodium sulfate, filtered and evaporated. Purification by chromatography (SiO2, heptane:ethyl acetate=4:1 to 2:1) afforded 6-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid methyl ester (72%) which was obtained as a light yellow solid. To a suspension of 6-[3-(4-chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid methyl ester (1.0 mmol) in THF (3 mL) and methanol (3 mL) was added a solution of lithium hydroxide monohydrate (85.1 mg, 2.0 mmol) in water (3 mL) and the resulting mixture stirred at room temperature overnight. The mixture was acidified to pH 4 with HCl (1 N, 30 mL) and the resulting mixture was filtered. The solid was dried to afford the title compound (100%) which was obtained as a light yellow solid. MS: m/e=331.1 [M−H]−.

Workup

  1. customwas obtained as a light yellow solid
  2. filtrationthe resulting mixture was filtered
  3. customThe solid was dried

Sources & evidence

ORD record
ord-742138d591d44a96bdd87725afe74a60
Source dataset
uspto-grants-2013_12
Patent number
US08604062B2

Reaction notes

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