Hydrogen Bromide → 5-Chloroisoindoline hydrochloride

HRID 41401Notes

Reaction equation

HRID 41401 reaction equation
C1(C)C=CC(S([N:10]2[CH2:18][C:17]3[C:12](=[CH:13][CH:14]=[C:15]([Cl:19])[CH:16]=3)[CH2:11]2)(=O)=O)=CC=1.C1(O)C=CC=CC=1.Br.C(O)(=O)CC>O>[ClH:19].[Cl:19][C:15]1[CH:16]=[C:17]2[C:12](=[CH:13][CH:14]=1)[CH2:11][NH:10][CH2:18]2

Participants

6

Reactant 4

HCID 260Hydrogen BromideHCID 996PhenolHCID 1032Propionic AcidHCID 151678915-Chloro-2-tosylisoindoline

Product 1

HCID 498535025-Chloroisoindoline hydrochlorideYield 97.2%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

1.0 g of 2-(p-toluensulphonyl)-5-chloroisoindoline and 1.0 g of phenol were added to a mixture of 8 ml of 48% hydrobromic acid and 1.4 ml of propionic acid, and then mixture was heated at reflux for 6 hours. The resultant reaction mixture was diluted with 10 ml of water and extracted twice with 50 ml of ethyl acetate. The water layer was basified with aqueous sodium hydroxide solution and extracted with ethyl acetate three times. The extract was concentrated and the crude product was diluted with 4N HCl/dioxane and stirred for 15 minutes before evaporating the HCl and then re-evaporating with toluene three times to give 0.3 g of 5-chloro-2,3-dihydro-1H-isoindole hydrochloride as a black solid. MS: [M+H]+ 153-15

Workup

  1. temperaturemixture was heated
  2. temperatureat reflux for 6 hours
  3. customThe resultant reaction mixture
  4. extractionextracted twice with 50 ml of ethyl acetate
  5. extractionextracted with ethyl acetate three times
  6. concentrationThe extract was concentrated
  7. additionthe crude product was diluted with 4N HCl/dioxane
  8. custombefore evaporating the HCl
  9. customre-evaporating with toluene three times

Sources & evidence

ORD record
ord-0886eac796c4459891311d769d6ca08a
Source dataset
uspto-grants-2013_09
Patent number
US08530469B2

Reaction notes

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