Nitrogen → 2(S)-Boc-amino-1-(5-methoxymethyl-1,3,4-oxadiazol-2-yl)-1-butanol
Reaction equation
[CH3:1][O:2][CH2:3][C:4]1[O:5][CH:6]=[N:7][N:8]=1.[Li]CCCC.[N:14]#N.CCOCC.[C:21]([C@:28](N)([CH2:31][CH3:32])[CH:29]=[O:30])([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22]>C1COCC1>[C:21]([C@@H:28]([CH2:31][CH3:32])[C:29]([NH2:14])([C:6]1[O:5][C:4]([CH2:3][O:2][CH3:1])=[N:8][N:7]=1)[OH:30])([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22]Participants
7
Reactant 5
Product 1
Reagents, catalysts & solvents 1
Conditions
- Temperature
- -45 °C
Procedure
To a stirred solution of 2-methoxymethyl-1,3,4-oxadiazole (4.6 g, 40 mmol) in THF (100 mL) was added n-BuLi (1.6 M solution in 25.2 mL of hexane) dropwise under N2 at −78° C. After 1 h, MgBr.Et2O (10.4 g, 40.3 mmol) was added and the reaction mixture was allowed to warm to −45° C. for 1 h before being treated with 2(S)-Boc-aminobutyraldehyde (5.28 g, 28.25 mmol) in THF (20 mL). The reaction mixture was stirred for 1 h, quenched with saturated NH4Cl, and extracted with ethyl acetate. The organic layer was washed with brine, dried with MgSO4 and concentrated. The residue was purified by silica gel column chromatography to yield 2(S)-Boc-amino-1-(5-methoxymethyl-[1.3.4]-oxadiazol-2-yl)-1-butanol (500 mg).
Workup
- customquenched with saturated NH4Cl
- extractionextracted with ethyl acetate
- washThe organic layer was washed with brine
- dry with materialdried with MgSO4
- concentrationconcentrated
- customThe residue was purified by silica gel column chromatography
Sources & evidence
- ORD record
- ord-ca32d1f6ad58478da574c924ebdf1e6a
- Source dataset
- uspto-grants-2010_02
- Patent number
- US07662849B2
Reaction notes
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