Lithium hydroxide, monohydrate → 2-[(5-{(1R)-4-Cyclohexyl-1-[2-(hydroxyamino)-2-oxoethyl]butyl}-1,2,4-oxadiazol-3-yl)methoxy]propanoic acid

HRID 2182946Notes

Reaction equation

HRID 2182946 reaction equation
[CH:1]1([CH2:7][CH2:8][CH2:9][C@@H:10]([C:16]2[O:20][N:19]=[C:18]([CH2:21][O:22][CH:23]([CH3:29])[C:24]([O:26]CC)=[O:25])[N:17]=2)[CH2:11][C:12]([NH:14][OH:15])=[O:13])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.O.[OH-].[Li+]>O1CCOCC1.O>[CH:1]1([CH2:7][CH2:8][CH2:9][C@@H:10]([C:16]2[O:20][N:19]=[C:18]([CH2:21][O:22][CH:23]([CH3:29])[C:24]([OH:26])=[O:25])[N:17]=2)[CH2:11][C:12]([NH:14][OH:15])=[O:13])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1

Participants

5

Reactant 2

HCID 168937Lithium hydroxide, monohydrateHCID 10273041Ethyl 2-[(5-{(1R)-4-cyclohexyl-1-[2-(hydroxyamino)-2-oxoethyl]butyl}-1,2,4-oxadiazol-3-yl)methoxy]propanoate

Product 1

HCID 102933262-[(5-{(1R)-4-Cyclohexyl-1-[2-(hydroxyamino)-2-oxoethyl]butyl}-1,2,4-oxadiazol-3-yl)methoxy]propanoic acidYield 92.7%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
0 °C

Procedure

A solution of ethyl 2-[(5-{(1R)-4-cyclohexyl-1-[2-(hydroxyamino)-2-oxoethyl]butyl}-1,2,4-oxadiazol-3-yl)methoxy]propanoate (Example 51) (184 mg, 0.45 mmol) in 1,4-dioxan (4 ml) and water (2 ml) was cooled to 0° C. and treated with lithium hydroxide monohydrate (2 mg, 0.48 mmol) and stirred at 0° C. for 2 hours. The solvent was partially removed under reduced pressure and diluted with water and washed with diethylether (×2). The aqueous layer was acidified to pH 1 with hydrochloric acid (2M) and washed with ethyl acetate (×2). The combined organic layers were washed with brine, dries over anhydrous sodium sulphate, filtered and the solvent was removed under reduced pressure to afford the title compound as a colourless oil (160 mg).

Workup

  1. customThe solvent was partially removed under reduced pressure
  2. additiondiluted with water
  3. washwashed with diethylether (×2)
  4. washwashed with ethyl acetate (×2)
  5. washThe combined organic layers were washed with brine, dries over anhydrous sodium sulphate
  6. filtrationfiltered
  7. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-192ca745859d431c8b322cffbb6e60dd
Source dataset
uspto-grants-2005_05
Patent number
US06897306B2

Reaction notes

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