Chlorosulfonic acid → 4-[(1,3-Dioxoisoindolin-2-yl)methyl]-1-benzenesulfonyl Chloride

HRID 2273976Notes

Reaction equation

HRID 2273976 reaction equation
[Cl:1][S:2]([OH:5])(=O)=[O:3].[CH:6]1[CH:11]=[CH:10][C:9]([CH2:12][N:13]2[C:22](=[O:23])[C:21]3[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=3)[C:14]2=[O:15])=[CH:8][CH:7]=1>>[O:23]=[C:22]1[C:21]2[C:16](=[CH:17][CH:18]=[CH:19][CH:20]=2)[C:14](=[O:15])[N:13]1[CH2:12][C:9]1[CH:8]=[CH:7][C:6]([S:2]([Cl:1])(=[O:5])=[O:3])=[CH:11][CH:10]=1

Participants

3

Reactant 2

HCID 24638Chlorosulfonic acidHCID 75059Benzylphthalimide

Product 1

HCID 210844074-[(1,3-Dioxoisoindolin-2-yl)methyl]-1-benzenesulfonyl ChlorideYield 73%

Conditions

Temperature
60 °C

Procedure

Under N2 atmosphere, 11.26 mL chlorosulfonic acid was cooled in an ice bath, and under stirring 10.00 g n-benzylphthalimide was added portionwise over a period of 20 min. The ice bath was removed and the mixture was heated to 60° C. for 30 min. After cooling to room temperature, the mixture was cautiously poured into ice water and extracted twice with chloroform. The combined organic layers were dried over MgSO4 and concentrated to a small volume. The product was obtained by trituration of the concentrate with PA to give 10.44 g (73%) of a white powder. 1H NMR (400 MHz, CDCl3) δ 4.95 (s, 2H), 7.67 (d, J=8.43 Hz, 2H), 7.73-7.78 (m, 2H), 7.85-7.90 (m, 2H), 8.00 (d, J=8.43 Hz, 2H).

Workup

  1. additionwas added portionwise over a period of 20 min
  2. customThe ice bath was removed
  3. temperatureAfter cooling to room temperature
  4. additionthe mixture was cautiously poured into ice water
  5. extractionextracted twice with chloroform
  6. dry with materialThe combined organic layers were dried over MgSO4
  7. concentrationconcentrated to a small volume
  8. customThe product was obtained by trituration of the
  9. concentrationconcentrate with PA

Sources & evidence

ORD record
ord-aaca17d935174ca68166f3e9b37b2fb5
Source dataset
uspto-grants-2015_09
Patent number
US09126942B2

Reaction notes

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