Potassium Hydroxide → (E)-6-chloro-2-methyl-5-(2-(pyridin-4-yl)prop-1-enyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole

HRID 1400423Notes

Reaction equation

HRID 1400423 reaction equation
[Cl:1][C:2]1[C:10]2[N:9]([CH2:11][C:12]([C:15]3[CH:20]=[CH:19][N:18]=[CH:17][CH:16]=3)(O)[CH3:13])[C:8]3[CH2:21][CH2:22][N:23]([CH3:25])[CH2:24][C:7]=3[C:6]=2[CH:5]=[CH:4][CH:3]=1.[OH-].[K+]>O=S(Cl)Cl.O>[Cl:1][C:2]1[C:10]2[N:9](/[CH:11]=[C:12](/[C:15]3[CH:20]=[CH:19][N:18]=[CH:17][CH:16]=3)\[CH3:13])[C:8]3[CH2:21][CH2:22][N:23]([CH3:25])[CH2:24][C:7]=3[C:6]=2[CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 2

HCID 14797Potassium HydroxideHCID 497796491-(6-Chloro-2-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-5(2H)-yl)-2-(pyridin-4-yl)propan-2-ol

Product 1

HCID 59455256(E)-6-chloro-2-methyl-5-(2-(pyridin-4-yl)prop-1-enyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 24386Thionyl ChlorideSolvent

Conditions

Temperature
100 °C

Procedure

1-(6-Chloro-2-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-5(2H)-yl)-2-(pyridin-4-yl)propan-2-ol (650 mg, 1.8 mmol) in SOCl2 (6.5 mL) was stirred at RT for 2 h. The progress of reaction was monitored by TLC and 1H NMR. The reaction mixture was concentrated under reduced pressure. The residue was dissolved in N-methyl-2-pyrrolidone (3 mL), KOH (737 mg, 13.1 mmol) was added and the reaction mixture was heated at 100° C. for 2 h. After it was cooled to RT, the reaction mixture was diluted with water and extracted with EtOAc. Organic was separated, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography (eluent 5% MeOH-DCM). 1H NMR (CD3OD, HCl salt) δ (ppm): 8.70 (d, 2H), 7.80 (d, 2H), 7.56 (s, 1H), 7.45 (d, 1H), 7.25 (d, 1H), 7.10 (t, 1H), 4.80 (m, 2H), 4.40 (m, 2H), 3.90 (m, 1H), 3.20 (m, 1H), 3.15 (s, 3H), 1.95 (s, 3H).

Workup

  1. customThe progress of reaction
  2. concentrationThe reaction mixture was concentrated under reduced pressure
  3. dissolutionThe residue was dissolved in N-methyl-2-pyrrolidone (3 mL)
  4. temperatureAfter it was cooled to RT
  5. extractionextracted with EtOAc
  6. customOrganic was separated
  7. dry with materialdried over sodium sulfate
  8. concentrationconcentrated under reduced pressure
  9. customThe residue was purified by silica gel chromatography (eluent 5% MeOH-DCM)

Sources & evidence

ORD record
ord-ce78330386f34202a6f9e62492abdf0f
Source dataset
uspto-grants-2014_12
Patent number
US08906925B2

Reaction notes

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