5-Thiazolecarboxylic acid, 2-methyl- → 2-{2-[3-(5-Fluoro-pyridin-2-yl)-5-methyl-isoxazol-4-yl]-2-hydroxy-ethyl}-thiazole-5-carboxylic acid

HRID 1923581Notes

Reaction equation

HRID 1923581 reaction equation
[CH3:1][C:2]1[S:3][C:4]([C:7]([OH:9])=[O:8])=[CH:5][N:6]=1.[Li]CCCC.[F:15][C:16]1[CH:17]=[CH:18][C:19]([C:22]2[C:26]([CH:27]=[O:28])=[C:25]([CH3:29])[O:24][N:23]=2)=[N:20][CH:21]=1>C1COCC1>[F:15][C:16]1[CH:17]=[CH:18][C:19]([C:22]2[C:26]([CH:27]([OH:28])[CH2:1][C:2]3[S:3][C:4]([C:7]([OH:9])=[O:8])=[CH:5][N:6]=3)=[C:25]([CH3:29])[O:24][N:23]=2)=[N:20][CH:21]=1

Participants

5

Reactant 3

HCID 988455-Thiazolecarboxylic acid, 2-methyl-HCID 866472723-(5-Fluoro-pyridin-2-yl)-5-methyl-isoxazole-4-carbaldehydeHCID 178418339Butyllithium

Product 1

HCID 666436562-{2-[3-(5-Fluoro-pyridin-2-yl)-5-methyl-isoxazol-4-yl]-2-hydroxy-ethyl}-thiazole-5-carboxylic acidYield 66%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a stirred solution of 2-methyl-thiazole-5-carboxylic acid (1.15 g, 8.05 mmol) in THF (67 mL) at −70° C. and under argon was added BuLi (1.6M in hexanes, 10.06 mL, 16.1 mmol) dropwise. After 2 h a solution of 3-(5-fluoro-pyridin-2-yl)-5-methyl-isoxazole-4-carbaldehyde (1.66 g, 8.05 mmol) in THF (24 mL) was added dropwise. After 3 h the reaction mixture was quenched with citric acid solution (5%, 50 mL) then warmed to room temperature and extracted with ethyl acetate. The combined extracts were washed with brine, water, dried over sodium sulfate, filtered and concentrated. Purification by trituration (ethyl acetate) afforded the title compound (1.85 g, 66%) as a light yellow solid. MS: m/e=348.2 [M−H]−.

Workup

  1. customAfter 3 h the reaction mixture was quenched with citric acid solution (5%, 50 mL)
  2. extractionextracted with ethyl acetate
  3. washThe combined extracts were washed with brine, water
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customPurification by trituration (ethyl acetate)

Sources & evidence

ORD record
ord-70c6b216fa2e4510bec1273ad2f673ea
Source dataset
uspto-grants-2012_05
Patent number
US08178522B2

Reaction notes

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