Pyridine → HCID 178527462, compound

HRID 1452825Notes

Reaction equation

HRID 1452825 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([S:9](Cl)(=[O:11])=[O:10])[CH:5]=[CH:6][C:7]=1[Cl:8].[NH2:13][C:14]1[CH:15]=[C:16]2[C:20](=[CH:21][CH:22]=1)[NH:19][N:18]=[C:17]2[Cl:23].N1C=CC=CC=1>O>[Cl:23][C:17]1[C:16]2[C:20](=[CH:21][CH:22]=[C:14]([NH:13][S:9]([C:4]3[CH:5]=[CH:6][C:7]([Cl:8])=[C:2]([Cl:1])[CH:3]=3)(=[O:11])=[O:10])[CH:15]=2)[NH:19][N:18]=1

Participants

5

Reactant 3

HCID 1049PyridineHCID 7383Benzenesulfonyl chloride, 3,4-dichloro-HCID 178507360HCID 178507360, compound

Product 1

HCID 178527462HCID 178527462, compoundYield 4.7%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

N-(3-Chloro-1H-indazol-5-yl)-3,4-dichlorobenzenesulfonamide can be obtained in the following way: a solution of 1.1 g of 3,4-dichlorobenzenesulfonyl chloride is added dropwise to a solution, cooled to 0° C. of 0.75 g of 5-amino-3-chloro-1H-indazole and of 14 ml of pyridine. After reacting for 10 minutes at a temperature in the region of 0° C. and 2 hours 30 minutes at a temperature in the region of 20° C., 50 ml of distilled water are added to the reaction medium. The medium is extracted with 50 ml and 25 ml of ethyl acetate. The organic phase is subsequently dried over magnesium sulfate, filtered and concentrated by evaporation under reduced pressure. The residue thus obtained is purified by chromatography on a silica column with a dichloromethane/methanol (99/1 by volume) mixture as eluent. The yellow oil thus obtained is again purified by chromatography on a silica column with dichloromethane as eluent. 0.08 g of N-(3-chloro-1H-indazol-5-yl)-3,4-dichlorobenzenesulfonamide is thus obtained in the form of a thick white oil (analysis C13H8Cl3N3O2S % calculated C, 41.46; H, 2.14; Cl, 28.24; N, 11.16; O, 8.50; S, 8.51% found C, 41.43; H, 2.58; N, 10.81; S, 7.84).

Workup

  1. additionare added to the reaction medium
  2. extractionThe medium is extracted with 50 ml and 25 ml of ethyl acetate
  3. dry with materialThe organic phase is subsequently dried over magnesium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated by evaporation under reduced pressure
  6. customThe residue thus obtained
  7. customis purified by chromatography on a silica column with a dichloromethane/methanol (99/1 by volume) mixture as eluent
  8. customThe yellow oil thus obtained
  9. customis again purified by chromatography on a silica column with dichloromethane as eluent

Sources & evidence

ORD record
ord-30f304200430497ca46603c69c618765
Source dataset
uspto-grants-2009_01
Patent number
US07473701B2

Reaction notes

Loading…