Chlorosuccinimide → 2-(S)-(2-Acetoxymethyl-4-amino-5-chloro-3-methyl-benzyl)-succinic acid diethyl ester

HRID 2378596Notes

Reaction equation

HRID 2378596 reaction equation
[CH2:1]([O:3][C:4](=[O:26])[C@@H:5]([CH2:12][C:13]1[CH:18]=[CH:17][C:16]([NH2:19])=[C:15]([CH3:20])[C:14]=1[CH2:21][O:22][C:23](=[O:25])[CH3:24])[CH2:6][C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH3:2].[Cl:27]N1C(=O)CCC1=O>C(#N)C.C(OCC)(=O)C>[CH2:1]([O:3][C:4](=[O:26])[C@@H:5]([CH2:12][C:13]1[CH:18]=[C:17]([Cl:27])[C:16]([NH2:19])=[C:15]([CH3:20])[C:14]=1[CH2:21][O:22][C:23](=[O:25])[CH3:24])[CH2:6][C:7]([O:9][CH2:10][CH3:11])=[O:8])[CH3:2]

Participants

5

Reactant 2

HCID 31398ChlorosuccinimideHCID 597319272-(S)-(2-Acetoxymethyl-4-amino-3-methyl-benzyl)-succinic acid diethyl ester

Product 1

HCID 597319572-(S)-(2-Acetoxymethyl-4-amino-5-chloro-3-methyl-benzyl)-succinic acid diethyl esterYield 59%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Conditions

Temperature
60 °C

Procedure

2-(S)-(2-Acetoxymethyl-4-amino-3-methyl-benzyl)-succinic acid diethyl ester (3.0 g, 8.2 mmol) was dissolved in acetonitrile (40 mL). Mixture was warmed to 60° C. N-Chlorosuccinimide (1.29 g, 9.7 mmol) was added to the warm solution. Reaction mixture was heated at reflux for 10 minutes. Mixture was cooled to room temperature then diluted with ethyl acetate (20 mL). Mixture was washed successively with saturated aqueous sodium bicarbonate (40 mL), and brine (20 mL). Organic was dried (magnesium sulfate), filtered and concentrated in vacuo. Silica gel chromatography (ethyl acetate-hexanes) afforded the desired product in 59% yield as an amber oil. 1H NMR (300 MHz, CDCl3): δ=6.98 (s, 1H), 5.15 (d, J=3.3, 2H), 4.09 (m, 4H), 2.99 (m, 2H), 2.69 (m, 2H), 2.39 (dd, J1=4.8, J2=16.5, 1H), 2.17 (s, 3H), 2.06 (s, 3H), 1.20 (m, 6H). MS m/e (M−C2H4O2+H)+=340.0.

Workup

  1. customReaction mixture
  2. temperaturewas heated
  3. temperatureat reflux for 10 minutes
  4. temperatureMixture was cooled to room temperature
  5. washMixture was washed successively with saturated aqueous sodium bicarbonate (40 mL), and brine (20 mL)
  6. dry with materialOrganic was dried (magnesium sulfate)
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo

Sources & evidence

ORD record
ord-27f105b310fa43e1aa84ddd138fa248f
Source dataset
uspto-grants-2008_12
Patent number
US07470679B2

Reaction notes

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