1,1'-Carbonyldiimidazole → 2-(3-Chlorophenyl)-N-(1-ethyl-2-pyrrolidinylmethyl)-3H-imidazo [4,5-b]pyridine-3-acetamide hydrochloride

HRID 623001

Reaction equation

HRID 623001 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([C:8]2[N:16]([CH2:17][C:18]([OH:20])=O)[C:11]3=[N:12][CH:13]=[CH:14][CH:15]=[C:10]3[N:9]=2)[CH:5]=[CH:6][CH:7]=1.C(N1C=CN=C1)([N:23]1C=CN=C1)=O.NC[CH2:35][CH:36]1[CH2:40][CH2:39][CH2:38][N:37]1[CH2:41][CH3:42]>O1CCCC1>[ClH:1].[Cl:1][C:2]1[CH:3]=[C:4]([C:8]2[N:16]([CH2:17][C:18]([NH:23][CH2:35][CH:36]3[CH2:40][CH2:39][CH2:38][N:37]3[CH2:41][CH3:42])=[O:20])[C:11]3=[N:12][CH:13]=[CH:14][CH:15]=[C:10]3[N:9]=2)[CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 682631,1'-CarbonyldiimidazoleHCID 143904542-(3-Chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acidHCID 144473471-Ethyl-2-pyrrolidineethanamine

Product 1

HCID 143902512-(3-Chlorophenyl)-N-(1-ethyl-2-pyrrolidinylmethyl)-3H-imidazo [4,5-b]pyridine-3-acetamide hydrochlorideYield 31.8%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A solution of 2-(3-chlorophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (5.76 g, 0.020 mole), 1,1'-carbonyldiimidazole (3.24 g, 0.020 mole), and anhydrous tetrahydrofuran (250 ml) was stirred at room temperature with a stream of nitrogen bubbling through for 2 hrs. The nitrogen flow was stopped and a solution of 2-(aminoethyl)-1-ethyl pyrrolidine (2.56 g, 0.02 mole) in dry tetrahydrofuran (50 ml) was added. The solution was stoppered and stirred at room temperature over the weekend. The reaction was concentrated in vacuo and partitioned between ethyl acetate (100 ml) and 5% potassium hydroxide solution (50 ml). The layers were separated and the aqueous portion washed with ethyl acetate (50 ml), water (25 ml), brine (25 ml), dried over sodium sulfate, and concentrated in vacuo. The solid residue was converted to the dihydrochloride salt and crystallized from isopropyl alcohol-diethyl ether. Recrystallization from isopropyl alcohol-isopropyl ether gave 1.38 g (15%) of an off-white solid, mp 186°-190° C. with decomposition.

Workup

  1. concentrationThe reaction was concentrated in vacuo
  2. custompartitioned between ethyl acetate (100 ml) and 5% potassium hydroxide solution (50 ml)
  3. customThe layers were separated
  4. washthe aqueous portion washed with ethyl acetate (50 ml), water (25 ml), brine (25 ml)
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated in vacuo
  7. customcrystallized from isopropyl alcohol-diethyl ether
  8. customRecrystallization from isopropyl alcohol-isopropyl ether

Sources & evidence

ORD record
ord-c3a9457de393402ead35da30b33d42a2
Source dataset
uspto-grants-1988_09
Patent number
US04772600

Linked notes

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