Potassium Hydroxide → 2,3,4,5-tetrahydro-2,8-dimethyl-5-(2-(2-methylpyrimidin-5-yl)ethyl)-1H-pyrido[4,3-b]indole

HRID 509766Notes

Reaction equation

HRID 509766 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+].[CH3:18][C:19]1[N:24]=[CH:23][C:22]([CH:25]=[CH2:26])=[CH:21][N:20]=1>CN1CCCC1=O.O>[CH3:1][N:2]1[CH2:15][CH2:14][C:5]2[N:6]([CH2:26][CH2:25][C:22]3[CH:21]=[N:20][C:19]([CH3:18])=[N:24][CH:23]=3)[C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]=2[CH2:3]1

Participants

6

Reactant 3

HCID 14797Potassium HydroxideHCID 2092911H-Pyrido[4,3-b]indole, 2,3,4,5-tetrahydro-2,8-dimethyl-HCID 668483512-Methyl-5-vinylpyrimidine

Product 1

HCID 578760802,3,4,5-tetrahydro-2,8-dimethyl-5-(2-(2-methylpyrimidin-5-yl)ethyl)-1H-pyrido[4,3-b]indoleYield 16%

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 (0.1 g, 0.0005 mol) in N-methyl 2-pyrolidone (1.0 mL) was added powdered potassium hydroxide (0.14 g, 0.0025 mol) and allowed to stir r for 10 min at RT. 2-methyl-5-vinyl pyrimidine (0.151 g, 0.0012 mol) was added and stirred for further 3 h at 80 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 using rotary evaporator. 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 purified through preparative TLC. to get the desired compound as yellow oil (0.025 g, 16% yield). 2, 8-Dimethyl-5-[2-(2-methyl-pyrimidin-5-yl)-ethyl]-2,3,4,5-tetrahydro-1H-pyrid[4,3-b]indole (0.025 g, 0.000078 mol) was dissolved in THF (1.0 mL). A solution of oxalic acid dihydrate (0.0098 g, 0.000078 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 (0.015 g, 47% yield).

Workup

  1. stirringstirred for further 3 h at 80 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. customevaporator
  7. 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)
  8. customthen purified through preparative TLC

Sources & evidence

ORD record
ord-9cb79ae2fd2c458db64b99fd213c88dc
Source dataset
uspto-grants-2015_08
Patent number
US09096591B2

Reaction notes

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