Methyl vinyl ketone → Tert-butyl 9-oxo-3-azaspiro[5.5]undec-7-ene-3-carboxylate

HRID 1478015Notes

Reaction equation

[CH:1]([CH:3]1[CH2:8][CH2:7][N:6]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:5][CH2:4]1)=O.[OH-].[K+].[CH3:18][C:19](=[O:22])[CH:20]=[CH2:21]>CCO>[O:22]=[C:19]1[CH2:20][CH2:21][C:3]2([CH2:8][CH2:7][N:6]([C:9]([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])=[O:10])[CH2:5][CH2:4]2)[CH:1]=[CH:18]1

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of tert-butyl 4-formylpiperidine-1-carboxylate (10.0 g, 46.9 mmol) and KOH (1.3 g, 23.5 mmol) in EtOH (200 mL) was added but-3-en-2-one (3.9 g, 56.3 mmol), the mixture was stirred at 70° C. for 16 h and concentrated in vacuo. The residue was purified by silica gel column chromatography (EtOAc/PE (v/v)=1/4) to give the product as brown oil (5.2 g, 41.8%).

Workup

concentrationconcentrated in vacuo
customThe residue was purified by silica gel column chromatography (EtOAc/PE (v/v)=1/4)

Sources & evidence

ORD record: ord-3e28273dfecd43d08e8928ea5048caa7
Source dataset: uspto-grants-2016_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09403801B2

Reaction notes

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