Thionyl Chloride → 4-(2-Piperidin-1-ylethoxy)benzoyl chloride hydrochloride

HRID 2198605Notes

Reaction equation

HRID 2198605 reaction equation
[ClH:1].[N:2]1([CH2:8][CH2:9][O:10][C:11]2[CH:19]=[CH:18][C:14]([C:15](O)=[O:16])=[CH:13][CH:12]=2)[CH2:7][CH2:6][CH2:5][CH2:4][CH2:3]1.S(Cl)([Cl:22])=O>CN(C)C=O.ClCCCl>[ClH:22].[N:2]1([CH2:8][CH2:9][O:10][C:11]2[CH:19]=[CH:18][C:14]([C:15]([Cl:1])=[O:16])=[CH:13][CH:12]=2)[CH2:7][CH2:6][CH2:5][CH2:4][CH2:3]1

Participants

5

Reactant 2

HCID 24386Thionyl ChlorideHCID 57438354-(2-Piperidinoethoxy)benzoic acid hydrochloride

Product 1

HCID 161119224-(2-Piperidin-1-ylethoxy)benzoyl chloride hydrochloride

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideCatalystHCID 111,2-DichloroethaneSolvent

Procedure

An acylating agent, in acid chloride form, was prepared by combining 26.3 g. of 4-(2-piperidinoethoxy)benzoic acid, hydrochloride, 36.5 g. of thionyl chloride and 1 drop of dimethylformamide in 200 ml. of 1,2-dichloroethane, and stirring the mixture under reflux for 2 hours under a nitrogen atmosphere. The mixture was then evaporated to dryness under vacuum to obtain the desired 4-(2-piperidinoethoxy)benzoyl chloride, hydrochloride, which was dissolved in 1 liter of 1,2-dichloroethane. To the solution was added 20 g. of 6-acetoxy-2-(4-acetoxyphenyl)benzo[b]thiophene and the mixture was stirred vigorously. To it was then added, over about 3 minutes, 73.4 g. of aluminum chloride. During the addition, the reaction mixture turned dark brown and hydrogen chloride evolved. The mixture was then stirred for one hour, and was poured over 1 liter of ice-water. The layers were separated, and the aqueous layer was extracted three times with 200 ml. portions of warm chloroform. The organic layers were combined and dried over magnesium sulfate, and were then filtered and evaporated under vacuum to obtain a brownish-yellow oil, which was not purified. The presence of the desired product was confirmed by thin layer chromatography (TLC) on silica gel, eluting with 9/1 chloroform/methanol, which showed that the major constituent ran at the same Rf as authentic 6-acetoxy-2-(4-acetoxyphenyl)-3-[4-(2-piperidinoethoxy)benzoyl]benzo[b]thiophene.

Workup

  1. temperatureunder reflux for 2 hours under a nitrogen atmosphere
  2. customThe mixture was then evaporated to dryness under vacuum

Sources & evidence

ORD record
ord-27d95a16756b475ca704f47cda3ab2ab
Source dataset
uspto-grants-1982_11
Patent number
US04358593

Reaction notes

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