Potassium Hydroxide → HCID 68284111, compound

HRID 1469490Notes

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[S:20][C:21]([CH:24]=[CH2:25])=[CH:22][CH:23]=1>CN1C(=O)CCC1.O>[CH3:1][N:2]1[CH:15]=[CH:14][C:5]2[N:6]([CH2:25][CH2:24][C:21]3[S:20][C:19]([CH3:18])=[CH:23][CH:22]=3)[C:7]3[CH:8]=[CH:9][C:10]([CH3:13])=[CH:11][C:12]=3[C:4]=2[CH2:3]1

Participants

Conditions

Temperature: 90 °C

Procedure

To a solution of 2,8-dimethyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indole (150 mg, 0.75 mmol) in NMP (1 mL) were added powdered KOH (294 mg, 5.25 mmol) and 2-methyl-5-vinyl-thiophene (186 mg, 1.50 mmol), and the reaction mixture stirred at 90° C. for 5 h. The reaction mixture was diluted with water (15 mL) and extracted with EtOAc (3×20 mL). The combined organic layer was washed with water (5×25 mL), dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (3% MeOH-DCM) followed by reverse phase HPLC to yield 2,8-dimethyl-5-[2-(5-methyl-thiophen-2-yl)-ethyl]-2,5-dihydro-1H-pyrido[4,3-b]indole. 1H NMR (CD3OD, TFA salt) δ (ppm): 7.3 (d, 1H), 7.22 (s, 1H), 7.08 (d, 1H), 6.5 (d, 1H), 6.3 (d, 1H), 4.6 (d, 1H), 4.2-4.4 (m, 3H), 3.7 (m, 2H), 3.2 (m, 3H), 3.03 (s, 3H), 2.7 (m, 1H), 2.38-2.42 (m, 6H).

Workup

extractionextracted with EtOAc (3×20 mL)
washThe combined organic layer was washed with water (5×25 mL)
dry with materialdried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure
customThe residue was purified by silica gel column chromatography (3% MeOH-DCM)

Sources & evidence

ORD record: ord-87dc324de2054c2ca87977a425b273bd
Source dataset: uspto-grants-2015_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09006263B2

Reaction notes

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