Lithium hydroxide, monohydrate → (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylic acid
Reaction equation
[C:1]([O:5][C:6]([NH:8][C@H:9]1[CH2:13][C@@:12]([CH2:18][O:19][CH2:20][CH3:21])([C:14]([O:16]C)=[O:15])[CH:11]=[CH:10]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].O.[OH-].[Li+]>O1CCCC1.CO.O>[C:1]([O:5][C:6]([NH:8][C@H:9]1[CH2:13][C@@:12]([CH2:18][O:19][CH2:20][CH3:21])([C:14]([OH:16])=[O:15])[CH:11]=[CH:10]1)=[O:7])([CH3:4])([CH3:3])[CH3:2]Participants
Reactant 2
Product 1
Reagents, catalysts & solvents 3
Procedure
To a solution of methyl (1R,4S)-4-[(tert-butoxycarbonyl)amino]-1-(ethoxymethyl)cyclopent-2-ene-1-carboxylate (3.25 g, 10.8 mmol) in tetrahydrofuran (58.7 mL), methanol (58.7 mL) and water (12.6 mL) was added lithium hydroxide monohydrate (0.731 g, 17.42 mmol). The pink mixture was heated to reflux overnight. The organic solvents were removed in vacuo and the aqueous layer was washed once with ether and then acidified slowly with concentrated HCl until the pH reached 4. The resulting suspension was extracted with methylene chloride three times. The combined organic layers were dried over MgSO4, filtered and concentrated to give the desired product as a mixture of two cis/trans isomers (2.75 g, 89%). MS calculated for C14H24NO5: (M+H) 286.2; found 186.2 (M+H-Boc).
Workup
- temperatureThe pink mixture was heated
- temperatureto reflux overnight
- customThe organic solvents were removed in vacuo
- washthe aqueous layer was washed once with ether
- extractionThe resulting suspension was extracted with methylene chloride three times
- dry with materialThe combined organic layers were dried over MgSO4
- filtrationfiltered
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-bf60838c75c044aaae32f1f8d7b27dd5
- Source dataset
- uspto-grants-2008_11
- Patent number
- US07449467B2
Reaction notes
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