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

HRID 623020Notes

Reaction equation

HRID 623020 reaction equation
[Br:1][C:2]1[CH:7]=[CH:6][C:5]([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:4][CH:3]=1.C(N1C=CN=C1)(N1C=CN=C1)=O.[NH2:33][CH:34]1[CH2:39][CH2:38][CH2:37][N:36]([CH2:40][CH3:41])[CH2:35]1>O1CCCC1>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[N:16]([CH2:17][C:18]([NH:33][CH:34]3[CH2:39][CH2:38][CH2:37][N:36]([CH2:40][CH3:41])[CH2:35]3)=[O:20])[C:11]3=[N:12][CH:13]=[CH:14][CH:15]=[C:10]3[N:9]=2)=[CH:6][CH:7]=1

Participants

5

Reactant 3

HCID 682631,1'-CarbonyldiimidazoleHCID 980943-amino-N-ethylpiperidineHCID 143904564-bromophenyl-3H-imidazo[4,5-b]pyridine-3-acetic acid

Product 1

HCID 143902812-(4-Bromophenyl)-N-(1-ethyl-3-piperidinyl)-3H-imidazo[4,5-b]pyridine-3-acetamideYield 62%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

A suspension of 2-(4-bromophenyl)-3H-imidazo[4,5-b]pyridine-3-acetic acid (6.0 g, 0.018 mole), 1,1'-carbonyldiimidazole (3.1 g, 0.019 mole), and anhydrous tetrahydrofuran (100 ml) was stirred at room temperature with a stream of nitrogen bubbling through it for 3 hours. The nitrogen flow was stopped and a solution of 3-amino-N-ethylpiperidine (2.6 g, 0.020 mole) in dry tetrahydrofuran (25 ml) was added. The solution was stirred at room temperature under nitrogen for 2 hours. The reaction mixture was concentrated in vacuo and the residue triturated in potassium bicarbonate solution (100 ml) and filtered. The filter cake was washed with water and recrystallized from isopropyl alcohol to give 4.9 g (62%) of a white solid, mp 190°-192° C.

Workup

  1. stirringThe solution was stirred at room temperature under nitrogen for 2 hours
  2. concentrationThe reaction mixture was concentrated in vacuo
  3. customthe residue triturated in potassium bicarbonate solution (100 ml)
  4. filtrationfiltered
  5. washThe filter cake was washed with water
  6. customrecrystallized from isopropyl alcohol

Sources & evidence

ORD record
ord-450ff352ec454f65b2bd29f08a52b394
Source dataset
uspto-grants-1988_09
Patent number
US04772600

Reaction notes

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