Calcium Carbonate → Benzoic acid, 4-amino-2-chloro-5-iodo-, methyl ester

HRID 403315Notes

Reaction equation

HRID 403315 reaction equation
[NH2:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([Cl:12])[CH:3]=1.C([O-])([O-])=O.[Ca+2].[I:18]Cl>CO.C(Cl)Cl>[NH2:1][C:2]1[C:11]([I:18])=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([Cl:12])[CH:3]=1.[NH2:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[C:4]([Cl:12])[C:3]=1[I:18]

Participants

7

Reactant 3

HCID 10112Calcium CarbonateHCID 24640Iodine chlorideHCID 11839197Methyl 4-Amino-2-chlorobenzoate

Product 2

HCID 11839203Benzoic acid, 4-amino-2-chloro-5-iodo-, methyl esterHCID 59625863Methyl 4-amino-2-chloro-3-iodobenzoate

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 6344DichloromethaneSolvent

Procedure

To a suspension of compound 22j (1.18 g, 6.38 mmol) and CaCO3 (1.28 g, 12.8 mmol) in MeOH (13 mL) was added a solution of iodine monochloride (1.09 g, 6.70 mmol) in CH2Cl2 (6 mL) dropwise at room temperature. The resulting reaction mixture was stirred at room temperature for 1.5 h. The reaction mixture was concentrated and then partitioned between EtOAc and water. The organic layer was concentrated and purified by flash column chromatography (silica gel, 20-25% EtOAc/hexanes) to provide methyl 4-amino-2-chloro-5-iodo-benzoate 22k as the major product and methyl 4-amino-2-chloro-3-iodo-benzoate 22l as the minor product.

Workup

  1. customThe resulting reaction mixture
  2. concentrationThe reaction mixture was concentrated
  3. custompartitioned between EtOAc and water
  4. concentrationThe organic layer was concentrated
  5. custompurified by flash column chromatography (silica gel, 20-25% EtOAc/hexanes)

Sources & evidence

ORD record
ord-2baa761db9904454b8007b2619e6d9b4
Source dataset
uspto-grants-2014_06
Patent number
US08748417B2

Reaction notes

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