Potassium Hydroxide → 2-(4-Cyclopropylpiperazin-1-yl)-6-(1,1-dioxo-1lambda6-isothiazolidin-2-ylmethyl)benzothiazole

HRID 1619256Notes

Reaction equation

HRID 1619256 reaction equation
[CH:1]1([N:4]2[CH2:9][CH2:8][N:7]([C:10]3[S:11][C:12]4[CH:18]=[C:17]([CH2:19][NH:20][S:21]([CH2:24][CH2:25][CH2:26]Cl)(=[O:23])=[O:22])[CH:16]=[CH:15][C:13]=4[N:14]=3)[CH2:6][CH2:5]2)[CH2:3][CH2:2]1.[OH-].[K+]>CCO>[CH:1]1([N:4]2[CH2:9][CH2:8][N:7]([C:10]3[S:11][C:12]4[CH:18]=[C:17]([CH2:19][N:20]5[CH2:26][CH2:25][CH2:24][S:21]5(=[O:23])=[O:22])[CH:16]=[CH:15][C:13]=4[N:14]=3)[CH2:6][CH2:5]2)[CH2:3][CH2:2]1

Participants

4

Reactant 2

HCID 14797Potassium HydroxideHCID 595887913-Chloropropane-1-sulfonic acid [2-(4-cyclopropylpiperazin-1-yl)benzothiazol-6-ylmethyl]amide

Product 1

HCID 595887992-(4-Cyclopropylpiperazin-1-yl)-6-(1,1-dioxo-1lambda6-isothiazolidin-2-ylmethyl)benzothiazoleYield 70.2%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of 3-chloropropane-1-sulfonic acid [2-(4-cyclopropylpiperazin-1-yl)benzothiazol-6-ylmethyl]amide (300 mg, 0.70 mmol) and potassium hydroxide (396 mg, 7.0 mmol) in EtOH (5 mL) was heated at reflux for 1 h. The volatiles were evaporated and the residue was extracted with CH2Cl2, washed with brine and concentrated in vacuo. The crude residue was purified by column chromatography on silica gel (elute: 5% CH2Cl2 in methanol) to give 2-(4-cyclopropylpiperazin-1-yl)-6-(1,1-dioxo-1λ6-isothiazolidin-2-ylmethyl)benzothiazole 193 mg (49%).

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 1 h
  3. customThe volatiles were evaporated
  4. extractionthe residue was extracted with CH2Cl2
  5. washwashed with brine
  6. concentrationconcentrated in vacuo
  7. customThe crude residue was purified by column chromatography on silica gel (elute: 5% CH2Cl2 in methanol)

Sources & evidence

ORD record
ord-a7b0571702db4c9aa237434189ebaed6
Source dataset
uspto-grants-2014_07
Patent number
US08772285B2

Reaction notes

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