Benzocaine → Ethyl 4-amino-3-chlorobenzoate

HRID 55223

Reaction equation

HRID 55223 reaction equation
[NH2:1][C:2]1[CH:12]=[CH:11][C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[CH:4][CH:3]=1.[Cl:13]N1C(=O)CCC1=O>ClCCl>[Cl:13][C:12]1[CH:11]=[C:5]([CH:4]=[CH:3][C:2]=1[NH2:1])[C:6]([O:8][CH2:9][CH3:10])=[O:7]

Participants

4

Reactant 2

HCID 2337BenzocaineHCID 31398Chlorosuccinimide

Product 1

HCID 1515285Ethyl 4-amino-3-chlorobenzoateYield 73.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of 8.26 g of ethyl 4-aminobenzoate, 8.26 g of N-chlorosuccinimide in 50 ml of dichloromethane is refluxed overnight. The mixture is washed with saturated NaHCO3 solution and dried (Na2SO4). The solution is passed through a thin pad of hydrous magnesium silicate and the filter cake washed with dichloromethane. The filtrate is concentrated and hexane added. Chilling gives 7.38 g of ethyl 3-chloro-4-aminobenzoate, m.p. 82°-83° C.

Workup

  1. temperatureis refluxed overnight
  2. washThe mixture is washed with saturated NaHCO3 solution
  3. dry with materialdried (Na2SO4)
  4. washthe filter cake washed with dichloromethane
  5. concentrationThe filtrate is concentrated
  6. additionhexane added
  7. temperatureChilling

Sources & evidence

ORD record
ord-6fafba2a6afb4f6683c7f9417e124f59
Source dataset
uspto-grants-1997_04
Patent number
US05624923

Linked notes

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