Hydrochloric Acid → 2,5-Dichlorobenzoylpiperidine

HRID 1741216Notes

Reaction equation

HRID 1741216 reaction equation
[Cl:1][C:2]1[CH:10]=[CH:9][C:8]([Cl:11])=[CH:7][C:3]=1[C:4](Cl)=[O:5].[NH:12]1[CH2:17][CH2:16][O:15][CH2:14][CH2:13]1.[NH:18]1[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1.Cl>[Cl-].[Al+3].[Cl-].[Cl-].C1(C)C=CC=CC=1.N1C=CC=CC=1.C1C=CC=CC=1>[Cl:1][C:2]1[CH:10]=[CH:9][C:8]([Cl:11])=[CH:7][C:3]=1[C:4]([N:12]1[CH2:17][CH2:16][O:15][CH2:14][CH2:13]1)=[O:5].[Cl:1][C:2]1[CH:10]=[CH:9][C:8]([Cl:11])=[CH:7][C:3]=1[C:4]([N:18]1[CH2:23][CH2:22][CH2:21][CH2:20][CH2:19]1)=[O:5]

Participants

10

Reactant 4

HCID 313Hydrochloric AcidHCID 8082PiperidineHCID 8083MorpholineHCID 179452,5-Dichlorobenzoyl chloride

Product 2

HCID 8682952,5-DichlorobenzoylpiperidineHCID 868908(2,5-Dichlorophenyl)(morpholino)methanone

Reagents, catalysts & solvents 4

HCID 6451240Aluminum(III) ChlorideCatalystHCID 241BenzeneSolventHCID 1049PyridineSolventHCID 1140TolueneSolvent2×

Procedure

2,5-dichlorobenzoyl-containing compounds (e.g. 2,5-dichlorobenzophenones and 2,5-dichlorobenzamides) can be readily prepared from 2,5-dichlorobenzoylchloride. Pure 2,5-dichlorobenzoylchloride is obtained by vacuum distillation of the mixture obtained from the reaction of commercially available 2,5-dichlorobenzoic acid with a slight excess of thionyl chloride in refluxing toluene. 2,5-dichlorobenzophenones (2,5-dichlorobenzophenone, 2,5-dichloro-4'-methylbenzophenone,2,5-dichloro-4'-methoxybenzophenone, and 2,5-dichloro-4'-phenoxy-benzophenone) are prepared by the Friedel-Crafts benzoylations of benzene and substituted benzenes (e.g. toluene, anisole, diphenyl ether), respectively, with 2,5-dichlorobenzoylchloride at 0-5° C. using 2-3 mol equivalents of aluminum chloride as a catalyst. The solid products obtained upon quenching with water are purified by recrystallization from toluene/hexanes. 2,5-dichlorobenzoylmorpholine and 2,5-dichlorobenzoylpiperidine are prepared from the reaction of 2,5-dichlorobenzoylchloride and either morpholine or piperidine, respectively, in toluene with pyridine added to trap the HCl that is evolved. After washing away the pyridinium salt and any excess amine, the product is crystallized from the toluene solution.

Workup

  1. customat 0-5° C.
  2. customThe solid products obtained
  3. customupon quenching with water
  4. customare purified by recrystallization from toluene/hexanes
  5. washAfter washing away the pyridinium salt
  6. customany excess amine, the product is crystallized from the toluene solution

Sources & evidence

ORD record
ord-fe0898687967449e9cb415cda9eb0518
Source dataset
uspto-grants-1999_10
Patent number
US05973075

Reaction notes

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