Lithium Hydroxide → 2-Chloro-4-[7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl]benzoic acid

HRID 452034Notes

Reaction equation

HRID 452034 reaction equation
[Cl:1][C:2]1[CH:11]=[C:10]([C:12]2[CH:13]=[N:14][C:15]3[N:16]([C:18]([CH2:21][C:22]4[CH:23]=[C:24]5[C:29](=[CH:30][CH:31]=4)[N:28]=[CH:27][CH:26]=[CH:25]5)=[CH:19][N:20]=3)[N:17]=2)[CH:9]=[CH:8][C:3]=1[C:4]([O:6]C)=[O:5].[OH-].[Li+]>O1CCCC1.CO.O>[Cl:1][C:2]1[CH:11]=[C:10]([C:12]2[CH:13]=[N:14][C:15]3[N:16]([C:18]([CH2:21][C:22]4[CH:23]=[C:24]5[C:29](=[CH:30][CH:31]=4)[N:28]=[CH:27][CH:26]=[CH:25]5)=[CH:19][N:20]=3)[N:17]=2)[CH:9]=[CH:8][C:3]=1[C:4]([OH:6])=[O:5]

Participants

6

Reactant 2

HCID 3939Lithium HydroxideHCID 58417078Methyl 2-chloro-4-[7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl]benzoate

Product 1

HCID 584170772-Chloro-4-[7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl]benzoic acidYield 60%

Reagents, catalysts & solvents 3

HCID 887MethanolSolventHCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To a solution of methyl 2-chloro-4-[7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl]benzoate (Step 3, 1.10 g, 2.56 mmol) in tetrahydrofuran (7.0 mL) and methanol (5.0 mL) was added a solution of lithium hydroxide (0.245 g, 10.2 mmol) in water (3.0 mL). The mixture was stirred at room temperature for 2 h. and concentrated under reduced pressure to a volume of about 3 mL. The residue was diluted with water (3 mL), and adjusted with 1N HCl to pH of about 4-5. The precipitate was filtered out, washed several times with water and dried in air overnight. The precipitate was then triturated sequentially with ether and dichloromethane (DCM)-Hexane (1:1). The desired product (638 mg, 60%) was obtained. LCMS (M+H)+: m/z=415.9/417.9.

Workup

  1. concentrationconcentrated under reduced pressure to a volume of about 3 mL
  2. additionThe residue was diluted with water (3 mL)
  3. filtrationThe precipitate was filtered out
  4. washwashed several times with water
  5. customdried in air overnight
  6. customThe precipitate was then triturated sequentially with ether and dichloromethane (DCM)-Hexane (1:1)

Sources & evidence

ORD record
ord-3ad0f4ae1f934a5cb25a1f45f75a2b10
Source dataset
uspto-grants-2013_07
Patent number
US08487096B2

Reaction notes

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