Sodium Chloride → 6-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid methyl ester

HRID 1911665Notes

Reaction equation

HRID 1911665 reaction equation
[H-].[Na+].[Cl:3][C:4]1[CH:9]=[CH:8][C:7]([C:10]2[C:14]([CH2:15][OH:16])=[CH:13][O:12][N:11]=2)=[CH:6][CH:5]=1.Cl[C:18]1[CH:27]=[CH:26][C:21]([C:22]([O:24][CH3:25])=[O:23])=[CH:20][N:19]=1.[Cl-].[Na+]>C1COCC1>[CH3:25][O:24][C:22](=[O:23])[C:21]1[CH:26]=[CH:27][C:18]([O:16][CH2:15][C:14]2[C:10]([C:7]3[CH:6]=[CH:5][C:4]([Cl:3])=[CH:9][CH:8]=3)=[N:11][O:12][CH:13]=2)=[N:19][CH:20]=1

Participants

6

Reactant 4

HCID 5234Sodium ChlorideHCID 24758Sodium hydrideHCID 254249Methyl 6-chloropyridine-3-carboxylateHCID 684443823-(4-Chloro-phenyl)-isoxazol-4-ylmethanol

Product 1

HCID 684427396-[3-(4-Chloro-phenyl)-isoxazol-4-ylmethoxy]-nicotinic acid methyl esterYield 72%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

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. extractionthe mixture was extracted with ethyl acetate
  2. washThe combined organic layers were then washed with water and brine
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. customevaporated
  6. customPurification by chromatography (SiO2, heptane:ethyl acetate=4:1 to 2:1)

Sources & evidence

ORD record
ord-ee7d8871aa5a4b02ba47e293c448784e
Source dataset
uspto-grants-2013_12
Patent number
US08604062B2

Reaction notes

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