3-Oxo-azetidine-1-carboxylic acid tert-butyl ester → 1383372-62-0

HRID 1506940Notes

Reaction equation

[C:1]([N:8]1[CH2:11][C:10](=[O:12])[CH2:9]1)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].[CH2:13]([Mg]Br)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>C1COCC1>[CH2:13]([C:10]1([OH:12])[CH2:11][N:8]([C:1]([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2])[CH2:9]1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1

Participants

Conditions

Temperature: 0 °C

Procedure

1-Boc-3-azetidinone (1) (2.0 gm, 11.68 mmol) was dissolved in dry THF (20 ml) under nitrogen and cooled to 0° C. Then the solution was added 2.0 M solution of Benzyl magnesium bromide (2) in THF (8.76 ml, 17.52 mmol) under nitrogen atmosphere. The reaction mixture was then allowed to warm to room temperature and stirred for 1 h. The reaction completion was monitored by TLC. The reaction was quenched by the addition of saturated ammonium chloride solution and extracted ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under vacuum. Crude product was then purified by column chromatography to give compound 3 (2.15 gm, 70%). 1H NMR (400 MHz, DMSOd6) δ: 1.40 (s, 9H), 2.25 (s, 2H), 4.00 (d, 2H), 4.35 (d, 2H), 6.05 (s, 1H), 7.18 (m, 3H), 7.25 (d, 2H); MS: m/z 263.90 (M+1)+.

Workup

temperatureto warm to room temperature
customThe reaction was quenched by the addition of saturated ammonium chloride solution
extractionextracted ethyl acetate
dry with materialThe organic layer was dried over anhydrous sodium sulfate
filtrationfiltered
concentrationconcentrated under vacuum
customCrude product was then purified by column chromatography

Sources & evidence

ORD record: ord-d00c390b9dac464a9db6a1fea1b08c84
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09221792B2

Reaction notes

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