Dichloromethane → 6-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl)-1-piperazinyl]-3,4-dihydro-2(lH)-quinolinone

HRID 704636Notes

Reaction equation

HRID 704636 reaction equation
[CH3:1][C:2]1[CH:7]=[CH:6][N:5]2[CH:8]=[C:9]([C:11]([N:13]3[CH2:18][CH2:17][N:16]([C:19]4[CH:20]=[C:21]([CH:28]=[CH:29][C:30](OCC)=[O:31])[C:22]([N+:25]([O-])=O)=[CH:23][CH:24]=4)[CH2:15][CH2:14]3)=[O:12])[N:10]=[C:4]2[CH:3]=1.ClCCl.[H][H]>[C].[Pd].CO>[CH3:1][C:2]1[CH:7]=[CH:6][N:5]2[CH:8]=[C:9]([C:11]([N:13]3[CH2:18][CH2:17][N:16]([C:19]4[CH:20]=[C:21]5[C:22](=[CH:23][CH:24]=4)[NH:25][C:30](=[O:31])[CH2:29][CH2:28]5)[CH2:15][CH2:14]3)=[O:12])[N:10]=[C:4]2[CH:3]=1

Participants

6

Reactant 3

HCID 6344DichloromethaneHCID 54465980Ethyl 3-[3-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl)-1-piperazinyl]-6-nitrophenyl]acrylateHCID 178418361HCID 178418361, compound

Product 1

HCID 200727986-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl)-1-piperazinyl]-3,4-dihydro-2(lH)-quinolinoneYield 78.7%

Reagents, catalysts & solvents 2

HCID 178418390HCID 178418390, compoundCatalystHCID 887MethanolSolvent

Procedure

A mixture of ethyl 3-[3-[4-(7-methylimidazo[1,2-a]-pyridine-2-carbonyl)-1-piperazinyl]-6-nitrophenyl]acrylate (926 mg), 10% palladium carbon (139 mg), dichloromethane (50 ml) and methanol (50 ml) was hydrogenated under one atmospheric pressure of hydrogen at ambient temperature for 2.5 hours. After filtration, acetic acid (1 ml) was added to the filtrate containing ethyl 3-[3-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl-1-piperazinyl]-6-aminophenyl]propionate and 6-[4-(7-methylimidazo[1,2-a]-pyridine-2-carbonyl)-1-piperazinyl]-3,4-dihydro-2(1H)-quinolinone and evaporated in vacuo. The residue was dissolved in chloroform (30 ml) and washed with saturated aqueous solution of sodium hydrogene carbonate. The extract was dried over magnesium sulfate and concentrated. The residue was crystallized from ethanol to give 6-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl)-1-piperazinyl]-3,4-dihydro-2(lH)-quinolinone (612 mg).

Workup

  1. filtrationAfter filtration, acetic acid (1 ml)
  2. additionwas added to the filtrate
  3. additioncontaining ethyl 3-[3-[4-(7-methylimidazo[1,2-a]pyridine-2-carbonyl-1-piperazinyl]-6-aminophenyl]propionate and 6-[4-(7-methylimidazo[1,2-a]-pyridine-2-carbonyl)-1-piperazinyl]-3,4-dihydro-2(1H)-quinolinone
  4. customevaporated in vacuo
  5. dissolutionThe residue was dissolved in chloroform (30 ml)
  6. washwashed with saturated aqueous solution of sodium hydrogene carbonate
  7. dry with materialThe extract was dried over magnesium sulfate
  8. concentrationconcentrated
  9. customThe residue was crystallized from ethanol

Sources & evidence

ORD record
ord-0c42e2c52dbd4abc8b3b4f979b59904e
Source dataset
uspto-grants-1991_01
Patent number
US04988698

Reaction notes

Loading…