2-Thiophenesulfonyl chloride → HCID 57901653, compound

HRID 1851489Notes

Reaction equation

HRID 1851489 reaction equation
[NH2:1][C:2]1[CH:3]=[C:4]([O:16][CH3:17])[CH:5]=[C:6]2[C:10]=1[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:7]2.[S:18]1[CH:22]=[CH:21][CH:20]=[C:19]1[S:23](Cl)(=[O:25])=[O:24]>N1C=CC=CC=1>[CH3:17][O:16][C:4]1[CH:5]=[C:6]2[C:10](=[C:2]([NH:1][S:23]([C:19]3[S:18][CH:22]=[CH:21][CH:20]=3)(=[O:25])=[O:24])[CH:3]=1)[NH:9][C:8]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[CH:7]2

Participants

4

Reactant 2

HCID 855182-Thiophenesulfonyl chlorideHCID 15399415Ethyl 7-amino-5-methoxy-1H-indole-2-carboxylate

Product 1

HCID 57901653HCID 57901653, compoundYield 57%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

To a mixed solution of ethyl 7-amino-5-methoxy-1H-indole-2-carboxylate (0.40 g) and pyridine (10 mL) was added 2-thiophenesulfonyl chloride (0.38 g) under ice-cooling, and the mixture was stirred at room temperature for 14 hr. The reaction mixture was concentrated under reduced pressure, and the residue was diluted with ethyl acetate, washed with aqueous citric acid solution, aqueous sodium hydrogencarbonate solution and brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=15:85-35:65), and the obtained crystals were recrystallized from ethyl acetate-hexane to give the title compound (370 mg, yield 57%) as colorless needle crystals. melting point 158-159° C.

Workup

  1. temperaturecooling
  2. concentrationThe reaction mixture was concentrated under reduced pressure
  3. additionthe residue was diluted with ethyl acetate
  4. washwashed with aqueous citric acid solution, aqueous sodium hydrogencarbonate solution and brine
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated under reduced pressure
  7. customthe obtained crystals were recrystallized from ethyl acetate-hexane

Sources & evidence

ORD record
ord-a12c6b160168497292c4616d56dae2e8
Source dataset
uspto-grants-2015_02
Patent number
US08957070B2

Reaction notes

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