Sodium Methoxide → 8-Ethoxy-4-hydroxy-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-2-one

HRID 1962365

Reaction equation

C[O:2][C:3]([C:5]1([NH:14][C:15](=[O:26])[CH2:16][C:17]2[C:22]([CH3:23])=[CH:21][C:20]([CH3:24])=[CH:19][C:18]=2[CH3:25])[CH2:10][CH2:9][N:8]([O:11][CH2:12][CH3:13])[CH2:7][CH2:6]1)=O.C[O-].[Na+]>CN(C)C=O.[Cl-].[Na+].O>[CH2:12]([O:11][N:8]1[CH2:9][CH2:10][C:5]2([NH:14][C:15](=[O:26])[C:16]([C:17]3[C:22]([CH3:23])=[CH:21][C:20]([CH3:24])=[CH:19][C:18]=3[CH3:25])=[C:3]2[OH:2])[CH2:6][CH2:7]1)[CH3:13]

Participants

Conditions

Temperature: 65 °C

Procedure

To a solution of 2.3 g of 1-ethoxy-4-[2-(2,4,6-trimethyl-phenyl)-acetylamino]-piperidine-4-carboxylic acid methyl ester in 26 ml of dimethylformamide was added 3 g of sodium methoxide. The reaction mixture was heated to 65° C. and stirred for 5 hours. The reaction mixture was poured into brine, neutralized and extracted with ethyl acetate. The organic phase was washed with brine, dried with sodium sulfate, filtered and concentrated. The residue was subjected to column chromatography (heptane/ethyl acetate 2:1) to yield 510 mg of 8-ethoxy-4-hydroxy-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-2-one (compound C8) as a solid, mp: >250° C.

Workup

extractionextracted with ethyl acetate
washThe organic phase was washed with brine
dry with materialdried with sodium sulfate
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-1500ab0208b248229a0d804bfbf65ad4
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08415369B2

Linked notes

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