Potassium Carbonate → 6-(5-Nitropyridin-2-yl)-2-oxa-6-azaspiro[3.3]heptane

HRID 340486Notes

Reaction equation

C(=O)([O-])[O-].[K+].[K+].[CH2:7]1[C:10]2([CH2:13][NH:12][CH2:11]2)[CH2:9][O:8]1.CO.CN(C=O)C.Cl[C:22]1[CH:27]=[CH:26][C:25]([N+:28]([O-:30])=[O:29])=[CH:24][N:23]=1>O>[N+:28]([C:25]1[CH:26]=[CH:27][C:22]([N:12]2[CH2:13][C:10]3([CH2:9][O:8][CH2:7]3)[CH2:11]2)=[N:23][CH:24]=1)([O-:30])=[O:29]

Participants

Conditions

Temperature: 80 °C

Procedure

Potassium carbonate (78 mg) and 2-oxa-6-azaspiro[3.3]heptane (30 mg) were added to a methanol/DMF (1 ml/2 ml) solution containing 2-chloro-5-nitropyridine (30 mg), followed by stirring at 80° C. for 3 hours. The reaction solution was adjusted to room temperature, and water was added, followed by extraction with ethyl acetate. The resultant was washed with saturated saline and dried over anhydrous sodium sulfate, the solvent was distilled away under reduced pressure, the obtained residue was purified by silica gel chromatography (n-hexane:ethyl acetate=1:1 to 1:4), and a white solid of 6-(5-nitropyridin-2-yl)-2-oxa-6-azaspiro[3.3]heptane (23 mg) was thus obtained.

Workup

customwas adjusted to room temperature
extractionfollowed by extraction with ethyl acetate
washThe resultant was washed with saturated saline
dry with materialdried over anhydrous sodium sulfate
distillationthe solvent was distilled away under reduced pressure
customthe obtained residue was purified by silica gel chromatography (n-hexane:ethyl acetate=1:1 to 1:4)

Sources & evidence

ORD record: ord-8e1d96e161e34dd9939da2f02031ad46
Source dataset: uspto-grants-2014_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08895585B2

Reaction notes

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