Sulfuric Acid → (S)-2-Hydroxymethyl-azetidine-1-carboxylic acid benzyl ester
Reaction equation
[NH:1]1[CH2:4][CH2:3][C@H:2]1[CH2:5][OH:6].S(=O)(=O)(O)O.C(=O)([O-])O.[Na+].[CH2:17]([O:24][C:25](Cl)=[O:26])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1>>[CH2:17]([O:24][C:25]([N:1]1[CH2:4][CH2:3][C@H:2]1[CH2:5][OH:6])=[O:26])[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1Participants
Procedure
Said solution of (S)-azetidine-2-methanol was adjusted to pH 10 by adding 10% sulfuric acid, sodium hydrogen carbonate (0.88 g, 10.5 mmol) was then added, and benzyloxycarbonyl chloride (1.76 g, 10.3 mmol) was added thereto at room temperature, followed by 14 hours of stirring. The solution was adjusted to pH 7 and extracted with ethyl acetate (50 mL ×2), the extract was washed with water (50 mL×1), dried over magnesium sulfate and filtered, and the filtrate was concentrated. The concentrate was subjected to column chromatography (Wakogel C-200) using toluene/ethyl acetate (1/1) as a mobile phase for separation/purification, to give (S)-N-benzyloxycarbonylazetidine-2-methanol (0.781 g, yield 75%) as a pale yellow oil. (S)-2-N-benzyloxycarbonyl-1,4-butanediol was obtained as a byproduct (0.096 g, yield 9%).
Workup
- additionwas then added
- extractionextracted with ethyl acetate (50 mL ×2)
- washthe extract was washed with water (50 mL×1)
- dry with materialdried over magnesium sulfate
- filtrationfiltered
- concentrationthe filtrate was concentrated
- customfor separation/purification
Sources & evidence
- ORD record
- ord-6d64ae7e557f4d218f13d91dd013be6a
- Source dataset
- uspto-grants-2000_11
- Patent number
- US06150535
Reaction notes
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