Water → 4-(2-Bromoethyl)-3-chloro-1,3-dihydro-2H-indol-2-one

HRID 358821Notes

Reaction equation

HRID 358821 reaction equation
C([Cl:4])(=O)C.[Br:5][CH2:6][CH2:7][C:8]1[CH:18]=[CH:17][CH:16]=[CH:15][C:9]=1[CH:10]=[CH:11][N+:12]([O-])=O.[OH2:19]>ClCCl>[Br:5][CH2:6][CH2:7][C:8]1[CH:18]=[CH:17][CH:16]=[C:15]2[C:9]=1[CH:10]([Cl:4])[C:11](=[O:19])[NH:12]2

Participants

5

Reactant 3

HCID 962Water2×HCID 6367Acetyl chlorideHCID 534279492-(2'-Bromoethyl)-beta-nitrostyrene

Product 1

HCID 103560034-(2-Bromoethyl)-3-chloro-1,3-dihydro-2H-indol-2-one

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent3×

Conditions

Temperature
20 °C

Procedure

To a precooled solution of ferric chloride (28.5 kg) in dichloromethane (340 1) at 0° C. was added acetyl chloride (9.2 kg) at such a rate that the reaction temperature did not exceed 5° C. The reaction mixture was stirred at between 0° and 5° C. for 15 minutes. To the mixture was added a pre-dryed solution of 2-(2'-bromoethyl)-β-nitrostyrene [12.88 kg (16.22 kg wet:water content 20.6%)]in dichloromethane (55 litres) at such a rate that the reaction temperature did not exceed 5° C. The reaction mixture was stirred for 5 hours at a temperature between 5 and 10° C. Analysis by TLC confirmed that the reaction had gone to completion. Water (240 1) was then added to the reaction mixture at such a rate so that the temperature did not exceed 20° C. The mixture was then stirred for 30 minutes. The dichloromethane layer was isolated and washed a further three times with water (three times 120 1). The dichloromethane layer was then distilled to a volume of about 60 1. After cooling to 20° C. petroleum ether (60/80 grade. 40 1) was added and the resulting precipitate was stirred at 10° C. for 30 minutes. HPLC analysis of the crude reaction mixture indicated a purity of 93.22% of the required product. 4-(2'-bromo-ethyl)-3-chloro-1,3-dihydro-2H-indol-2-on by filtration, the filtrate washed with petroleum ether (60 1) and dried at 80° C. overnight to give 10.8 kg (78%) of of the title compound.

Workup

  1. customdid not exceed 5° C
  2. customdid not exceed 5° C
  3. stirringThe reaction mixture was stirred for 5 hours at a temperature between 5 and 10° C
  4. customdid not exceed 20° C
  5. stirringThe mixture was then stirred for 30 minutes
  6. washwashed a further three times with water (three times 120 1)
  7. distillationThe dichloromethane layer was then distilled to a volume of about 60 1
  8. additionwas added
  9. stirringthe resulting precipitate was stirred at 10° C. for 30 minutes
  10. customHPLC analysis of the crude reaction mixture

Sources & evidence

ORD record
ord-619c51b4cca1402991d7d75c08d4ab4d
Source dataset
uspto-grants-1991_03
Patent number
US04997954

Reaction notes

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