Methyl chloroformate → Carbonic acid 3-(2,5-dimethyl-phenyl)-8-methoxy-2-oxo-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester methyl ester

HRID 1022373Notes

Reaction equation

HRID 1022373 reaction equation
[CH3:1][C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][C:3]=1[C:9]1[C:10](=[O:22])[NH:11][C:12]2([CH2:19][CH2:18][N:17]([O:20][CH3:21])[CH2:16][CH2:15]2)[C:13]=1[OH:14].C(N(C(C)C)C(C)C)C.Cl[C:33]([O:35][CH3:36])=[O:34]>ClC1C=CC=CC=1>[CH3:36][O:35][C:33](=[O:34])[O:14][C:13]1[C:12]2([CH2:19][CH2:18][N:17]([O:20][CH3:21])[CH2:16][CH2:15]2)[NH:11][C:10](=[O:22])[C:9]=1[C:3]1[CH:4]=[C:5]([CH3:8])[CH:6]=[CH:7][C:2]=1[CH3:1]

Participants

5

Reactant 3

HCID 6586Methyl chloroformateHCID 81531DiisopropylethylamineHCID 547422463-(2,5-Dimethyl-phenyl)-4-hydroxy-8-methoxy-1,8-diazaspiro[4.5]dec-3-en-2-one

Product 1

HCID 44603930Carbonic acid 3-(2,5-dimethyl-phenyl)-8-methoxy-2-oxo-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester methyl ester

Reagents, catalysts & solvents 1

HCID 7964ChlorobenzeneSolvent3×

Conditions

Temperature
50 °C

Procedure

To a solution of 200 mg of 3-(2,5-dimethyl-phenyl)-4-hydroxy-8-methoxy-1,8-diaza-spiro[4.5]dec-3-en-2-one and 0.14 ml of ethyl diisopropyl amine in 2 ml of chlorobenzene is added a solution of 66 mg of methyl chloroformate in 0.5 ml of chlorobenzene at 50° C. After stirring for 1 hour at 50° C., the reaction mixture is cooled to room temperature, diluted with 5 ml of chlorobenzene and washed with cold 5% aqueous sodium hydroxide and water. The organic phase is separated, dried over sodium sulfate, filtered and evaporated. The residue is purified by flash chromatography on silica gel. Yield: 120 mg of carbonic acid 3-(2,5-dimethyl-phenyl)-8-methoxy-2-oxo-1,8-diaza-spiro[4.5]dec-3-en-4-yl ester methyl ester. This material is triturated with ethyl acetate/hexane, filtered and dried to afford a solid, mp: 186-188° C.

Workup

  1. temperaturethe reaction mixture is cooled to room temperature
  2. washwashed with cold 5% aqueous sodium hydroxide and water
  3. customThe organic phase is separated
  4. dry with materialdried over sodium sulfate
  5. filtrationfiltered
  6. customevaporated
  7. customThe residue is purified by flash chromatography on silica gel
  8. customThis material is triturated with ethyl acetate/hexane
  9. filtrationfiltered
  10. customdried
  11. customto afford a solid, mp: 186-188° C.

Sources & evidence

ORD record
ord-b0acdd7f06f4489c810b12776ad5494c
Source dataset
uspto-grants-2014_05
Patent number
US08722578B2

Reaction notes

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