(RS)-N,N-dimethyl-{2-[4-(alpha-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide dihydrochloride → Cetirizine Hydrochloride

HRID 1072262Notes

Reaction equation

HRID 1072262 reaction equation
Cl.Cl.CN(C)[C:5](=[O:30])[CH2:6][O:7][CH2:8][CH2:9][N:10]1[CH2:15][CH2:14][N:13]([CH:16]([C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[C:17]2[CH:22]=[CH:21][C:20]([Cl:23])=[CH:19][CH:18]=2)[CH2:12][CH2:11]1.C(O)(=O)/C=C/C(O)=[O:36].CN(C)C(=O)COCCN1CCN(C(C2C=CC=CC=2)C2C=CC([Cl:60])=CC=2)CC1>>[ClH:23].[ClH:60].[C:24]1([CH:16]([N:13]2[CH2:14][CH2:15][N:10]([CH2:9][CH2:8][O:7][CH2:6][C:5]([OH:30])=[O:36])[CH2:11][CH2:12]2)[C:17]2[CH:18]=[CH:19][C:20]([Cl:23])=[CH:21][CH:22]=2)[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1

Participants

3

Reactant 2

HCID 22391908(RS)-N,N-dimethyl-{2-[4-(alpha-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide dihydrochlorideHCID 22391911(RS)-N,N-dimethyl-{2-[4-(alpha-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide fumarate

Product 1

HCID 55182Cetirizine HydrochlorideYield 77.8%

Procedure

The procedure described in Example 13 is followed with the difference that, instead of the (RS)-N,N-dimethyl-{2-[4-(α-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide dihydrochloride, 106.4 g (0.2 moles) of (RS)-N,N-dimethyl-{2-[4-(α-phenyl-p-chloro-benzyl)piperazin-1-yl]ethoxy}-acetamide fumarate is used, and, after adjusting the pH of the reaction mixture to 3.8, the precipitated fumaric acid is filtered to facilitate the extraction with dichloromethane. Thus, 71.8 g (77.8%) of the title compound are obtained, m.p.: 225-228° C. The purity of the product corresponds to the quality requirements given in Eur. Pharm., 3, 1997, 1084.

Workup

  1. filtrationthe precipitated fumaric acid is filtered
  2. extractionthe extraction with dichloromethane

Sources & evidence

ORD record
ord-39b56c52380e47fe8dc73857565a99ab
Source dataset
uspto-grants-2005_06
Patent number
US06908999B2

Reaction notes

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