Pyridine → 6-[3-nitro-4-[4-(2-pyrimidyl)-piperazin-1-yl]phenyl]-4,5-dihydro-5-methyl-3(2H)-pyridazinone

HRID 1031460Notes

Reaction equation

HRID 1031460 reaction equation
Cl[C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]([CH3:15])[CH2:10][C:11](=[O:14])[NH:12][N:13]=2)=[CH:4][C:3]=1[N+:16]([O-:18])=[O:17].[N:19]1[CH:24]=[CH:23][CH:22]=[N:21][C:20]=1[N:25]1[CH2:30][CH2:29][NH:28][CH2:27][CH2:26]1.N1C=CC=CC=1>O1CCOCC1>[N+:16]([C:3]1[CH:4]=[C:5]([C:8]2[CH:9]([CH3:15])[CH2:10][C:11](=[O:14])[NH:12][N:13]=2)[CH:6]=[CH:7][C:2]=1[N:28]1[CH2:29][CH2:30][N:25]([C:20]2[N:19]=[CH:24][CH:23]=[CH:22][N:21]=2)[CH2:26][CH2:27]1)([O-:18])=[O:17]

Participants

5

Reactant 3

HCID 1049PyridineHCID 887471-(2-Pyrimidinyl)piperazine2×HCID 28744326-(4-chloro-3-nitrophenyl)-5-methyl-4,5-dihydropyridazin-3(2H)-one

Product 1

HCID 144594656-[3-nitro-4-[4-(2-pyrimidyl)-piperazin-1-yl]phenyl]-4,5-dihydro-5-methyl-3(2H)-pyridazinoneYield 70%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

3.0 g (11.2 mmol) of 6-(4-chloro-3-nitro-phenyl)-4,5-dihydro-5-methyl-3(2H)-pyridazinone, 3.7 g (22.4 mmol) of 1-(2-pyrimidyl)-piperazine and 0.9 g (11.2 mmol) of pyridine are boiled under reflux in 50 ml of dioxane. A further 1.9 g (11.6 mmol) of 1-(2-pyrimidyl)-piperazine is added after 6 hours and the reaction mixture is boiled for a further 4 hours. When the reaction mixture has cooled, it is poured out on 300 ml of ice water and the precipitated solid is suction filtered, washed with a small quantity of diethyl ether and recrystallized from 40 ml of 2-methoxyethanol. 3.1 g (70%) of orange red crystals, m.p. 232° to 233° C., are obtained.

Workup

  1. temperatureWhen the reaction mixture has cooled
  2. filtrationfiltered
  3. washwashed with a small quantity of diethyl ether
  4. customrecrystallized from 40 ml of 2-methoxyethanol

Sources & evidence

ORD record
ord-9764e7d0ab2b474a8bebfdcee5c26bcb
Source dataset
uspto-grants-1990_09
Patent number
US04954501

Reaction notes

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