Potassium Hydroxide → HCID 57876226, compound

HRID 1465331Notes

Reaction equation

HRID 1465331 reaction equation
[CH3:1][N:2]1[CH2:15][CH2:14][C:5]2[NH:6][C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]=2[CH2:3]1.[OH-].[K+].[CH2:18]([C:20]1[CH:25]=[CH:24][C:23]([CH:26]=[CH2:27])=[CH:22][N:21]=1)[CH3:19]>CN1CCCC1=O.O>[CH2:18]([C:20]1[N:21]=[CH:22][C:23]([CH2:26][CH2:27][N:6]2[C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]3[CH2:3][N:2]([CH3:1])[CH2:15][CH2:14][C:5]2=3)=[CH:24][CH:25]=1)[CH3:19]

Participants

6

Reactant 3

HCID 14797Potassium HydroxideHCID 2092911H-Pyrido[4,3-b]indole, 2,3,4,5-tetrahydro-2,8-dimethyl-HCID 151623692-Ethyl-5-vinylpyridine

Product 1

HCID 57876226HCID 57876226, compoundYield 18%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 13387N-methyl-2-pyrrolidoneSolvent

Procedure

To a solution of 2,8-Dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (0.15 g, 0.749 mmol) in N-methyl 2-pyrolidone (1.2 mL) was added powdered potassium hydroxide (0.42 g, 7.49 mmol) and allowed to stir for 10 min at RT. 2-Ethyl-5-vinyl-pyridine (0.299 g, 2.24 mmol) was added and stirred for further 18 h, at 100 deg C. After completion (TLC), reaction mixture was diluted with water (15 mL) and extracted with ethyl acetate (3×50 mL). The organic layer was dried over anhydrous sodium sulphate and concentrated under reduced pressure. The crude was purified through column chromatography (7% MeOH:DCM in silica 100-200 mesh, Diameter of column 2.5 cm, Height of silica—approx. 5 inch), Then further purified by preparative TLC, to give the desired compound as yellow oil (0.045 g, 18% yield). 5-[2-(6-Ethyl-pyridin-3-yl)-ethyl]-2,8-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (0.040 g, 0.12 mol) was dissolved in THF (1.0 mL). A solution of oxalic acid dihydrate (0.012 g, 0.096 mol) in THF (1.0 mL) was added and stirred for 30 min at RT, Precipitate obtained was filtered and dried to give oxalate salt as off white solid (0.030 g, 60% yield).

Workup

  1. stirringstirred for further 18 h, at 100 deg C
  2. customAfter completion (TLC), reaction mixture
  3. extractionextracted with ethyl acetate (3×50 mL)
  4. dry with materialThe organic layer was dried over anhydrous sodium sulphate
  5. concentrationconcentrated under reduced pressure
  6. customThe crude was purified through column chromatography (7% MeOH:DCM in silica 100-200 mesh, Diameter of column 2.5 cm, Height of silica—approx. 5 inch)
  7. customfurther purified by preparative TLC

Sources & evidence

ORD record
ord-9ec1c9df70f44093b243d7e9698e8234
Source dataset
uspto-grants-2015_04
Patent number
US08999978B2

Reaction notes

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