Potassium Hydroxide → (E)-7-chloro-2-methyl-5-(2-(pyridin-4-yl)prop-1-enyl)-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole

HRID 1401496Notes

Reaction equation

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

Participants

Conditions

Temperature: 100 °C

Procedure

1-(7-Chloro-2-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-5(2H)-yl)-2-(pyridin-4-yl)propan-2-ol (1 g, 2.8 mmol) in SOCl2 (10 mL) was stirred RT for 2 h. The reaction mixture was concentrated under reduced pressure. The residue was dissolved in N-methyl-2-pyrrolidone (6 mL), KOH (1.5 g, 28 mmol) was added and heated at 100° C. for 2 h. The reaction mixture was cooled to RT, diluted with water and extracted with EtOAc. The organic layer was washed with water and concentrated and purified by silica gel chromatography, 100-200 mesh (eluent in 5% MeOH-DCM). 1H NMR (CD3OD, HCl salt) δ (ppm): 8.90 (d, 2H), 8.40 (d, 2H), 7.80 (s, 1H), 7.55 (d, 1H), 7.38 (s, 1H), 7.22 (d, 1H), 4.80 (d, 1H), 4.40 (d, 1H), 3.90 (m, 1H), 3.60 (m, 2H), 3.25 (m, 1H), 3.18 (s, 3H), 2.20 (s, 3H).

Workup

concentrationThe reaction mixture was concentrated under reduced pressure
dissolutionThe residue was dissolved in N-methyl-2-pyrrolidone (6 mL)
temperatureThe reaction mixture was cooled to RT
extractionextracted with EtOAc
washThe organic layer was washed with water
concentrationconcentrated
custompurified by silica gel chromatography, 100-200 mesh (eluent in 5% MeOH-DCM)

Sources & evidence

ORD record: ord-9da339ac70e144af978ccd1469ca3290
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08907097B2

Reaction notes

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