Hydrochloric Acid → 1-{1-[2-Hydroxy-3-(2-methoxyphenoxy)-propyl]-4-piperidyl}-3-(4-methoxy-phenyl)-imidazolidin-2-one-hydrochloride

HRID 1855992Notes

Reaction equation

HRID 1855992 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([N:9]2[CH2:13][CH2:12][N:11]([CH:14]3[CH2:19][CH2:18][NH:17][CH2:16][CH2:15]3)[C:10]2=[O:20])=[CH:5][CH:4]=1.[CH3:21][O:22][C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][C:24]=1[O:29][CH2:30][CH:31]1[O:33][CH2:32]1.[ClH:34]>C(O)(C)C>[ClH:34].[OH:33][CH:31]([CH2:30][O:29][C:24]1[CH:25]=[CH:26][CH:27]=[CH:28][C:23]=1[O:22][CH3:21])[CH2:32][N:17]1[CH2:18][CH2:19][CH:14]([N:11]2[CH2:12][CH2:13][N:9]([C:6]3[CH:7]=[CH:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=3)[C:10]2=[O:20])[CH2:15][CH2:16]1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 98357((o-Methoxyphenoxy)methyl)oxiraneHCID 233473361-(4-Methoxyphenyl)3-(4-piperidyl)-2-imidazolidinone

Product 1

HCID 233473501-{1-[2-Hydroxy-3-(2-methoxyphenoxy)-propyl]-4-piperidyl}-3-(4-methoxy-phenyl)-imidazolidin-2-one-hydrochloride

Reagents, catalysts & solvents 1

HCID 3776IsopropanolSolvent

Procedure

A mixture of 17.9 g of 1-(4-methoxy-phenyl)-3-(4-piperidyl)-2-imidazolidinone and 11.7 g of 1-(2-methoxyphenyloxy)-2,3-epoxypropane in 200 ml of isopropyl alcohol is refluxed for 6 hours. The mixture is thereafter acidified with 5 N methanolic hydrochloric acid and concentrated under reduced pressure. The residue is freed from moisture still adhering to it by treatment with toluene. Recrystallisation of the residue from methanol with the addition of activated charcoal yields the 1-{1-[2-hydroxy-3-(2-methoxyphenoxy)-propyl]-4-piperidyl}-3-(4-methoxy-phenyl)-imidazolidin-2-one-hydrochloride as a white crystalline substance with a melting point of 214°-215° C. The 1-(4-methoxy-phenyl)-3-(4-piperidyl)-2-imidazolidinone used as starting material can be prepared as follows: A mixture of 61.5 g of 4-methoxy-aniline and 51.3 g of 2-bromoethylamine-hydrobromide in 125 ml of methyl ethyl ketone is refluxed for 5 hours with stirring. The viscous suspension is thereafter evaporated to dryness under reduced pressure. The residue is suspended in 150 ml of isopropanol and then collected by filtration. The filter cake is washed with three 50 ml portions of isopropanol and with two 50 ml portions of diethyl ether. The crystalline product is made alkaline with a concentrated aqueous ammonia solution and extracted with five 50 ml portions of chloroform. The extracts are dried over sodium sulphate and concentrated under reduced pressure. The oily residue crystallises after trituration to give the 1-(4-methoxyphenyl)-ethylenediamine with a melting point of 64° C.

Workup

  1. temperatureis refluxed for 6 hours
  2. concentrationconcentrated under reduced pressure
  3. customRecrystallisation of the residue from methanol
  4. additionwith the addition of activated charcoal

Sources & evidence

ORD record
ord-7c83138576244f369ce55b270e224710
Source dataset
uspto-grants-1980_08
Patent number
US04217350

Reaction notes

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