Acetonitrile → 1-[4-[2-[4-(6-Chloro-1H-indazol-3-yl)1-piperazinyl]ethoxy]-3-methoxyphenyl]-ethanone

HRID 370145Notes

Reaction equation

HRID 370145 reaction equation
[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6]([N:11]3[CH2:16][CH2:15][NH:14][CH2:13][CH2:12]3)=[N:7][NH:8]2)=[CH:4][CH:3]=1.C([O-])([O-])=O.[K+].[K+].Cl[CH2:24][CH2:25][O:26][C:27]1[CH:32]=[CH:31][C:30]([C:33](=[O:35])[CH3:34])=[CH:29][C:28]=1[O:36][CH3:37].C(#N)C>O>[Cl:1][C:2]1[CH:10]=[C:9]2[C:5]([C:6]([N:11]3[CH2:12][CH2:13][N:14]([CH2:24][CH2:25][O:26][C:27]4[CH:32]=[CH:31][C:30]([C:33](=[O:35])[CH3:34])=[CH:29][C:28]=4[O:36][CH3:37])[CH2:15][CH2:16]3)=[N:7][NH:8]2)=[CH:4][CH:3]=1

Participants

6

Reactant 4

HCID 6342AcetonitrileHCID 11430Potassium CarbonateHCID 144071701-[4-(2-Chloroethoxy)-3-methoxyphenyl]ethanoneHCID 148234706-chloro-3-(1-piperazinyl)-1H-indazole

Product 1

HCID 219600041-[4-[2-[4-(6-Chloro-1H-indazol-3-yl)1-piperazinyl]ethoxy]-3-methoxyphenyl]-ethanoneYield 23%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

A mixture of 6-chloro-[3-(1-piperazinyl)]-1H-indazole (2.1 g, 8.9 mmol, K2CO3 (1.5 g, 10.7 mmol), KI (100 mg), 1-[4-(2-chloroethoxy)-3-methoxyphenyl]ethanone (2.2 g, 9.8 mml) and acetonitrile (70 ml) was stirred at reflux for 48 hours under N2. The cooled reaction was poured into water and the aqueous mixture was extracted with ethyl acetate. The organic extract was washed with water, dried with MgSO4 and concentrated to yield 6.0 of a light yellow oil. The oil was purified by preparative HPLC (Waters Associates prep LC/System 500, employing 2 silica gel columns and 5.5% methanol/methylene chloride as eluent). Concentration of later fractions provided 1.6 g, of an off-white solid. This was combined with an additional sample (3.4 g total) and two consecutive recrystallizations from ethanol yielded 2.1 g (23%) of 1-[4-[2-[4-(6-chloro-1H-indazol-3-yl)-1-piperazinyl]ethoxy]-3-methoxy-phenyl]ethanone as an off-white solid, m.p.=154-156° C.

Workup

  1. temperatureat reflux for 48 hours under N2
  2. customThe cooled reaction
  3. extractionthe aqueous mixture was extracted with ethyl acetate
  4. extractionThe organic extract
  5. washwas washed with water
  6. dry with materialdried with MgSO4
  7. concentrationconcentrated
  8. customto yield 6.0 of a light yellow oil
  9. customThe oil was purified by preparative HPLC (Waters Associates prep LC/System 500, employing 2 silica gel columns and 5.5% methanol/methylene chloride as eluent)
  10. customConcentration of later fractions provided 1.6 g
  11. customThis was combined with an additional sample (3.4 g total) and two consecutive recrystallizations from ethanol

Sources & evidence

ORD record
ord-2567fdfb24144b9b8084126f1e84eaed
Source dataset
uspto-grants-2000_10
Patent number
US06140345

Reaction notes

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