Sulfuric Acid → HCID 68488721, compound

HRID 1400380Notes

Reaction equation

HRID 1400380 reaction equation
[CH2:1]([N:3]1[CH2:26][CH2:25][C:6]2[N:7]([CH2:15][CH:16]([C:18]3[CH:23]=[CH:22][C:21]([CH3:24])=[CH:20][CH:19]=3)O)[C:8]3[CH:9]=[CH:10][C:11]([CH3:14])=[CH:12][C:13]=3[C:5]=2[CH2:4]1)[CH3:2].S(=O)(=O)(O)O.[OH-].[K+]>>[CH2:1]([N:3]1[CH2:26][CH2:25][C:6]2[N:7]([CH:15]=[CH:16][C:18]3[CH:19]=[CH:20][C:21]([CH3:24])=[CH:22][CH:23]=3)[C:8]3[CH:9]=[CH:10][C:11]([CH3:14])=[CH:12][C:13]=3[C:5]=2[CH2:4]1)[CH3:2]

Participants

4

Reactant 3

HCID 1118Sulfuric AcidHCID 14797Potassium HydroxideHCID 57875895HCID 57875895, compound

Product 1

HCID 68488721HCID 68488721, compound

Conditions

Temperature
5 °C

Procedure

2-(2-Ethyl-1,2,3,4-tetrahydro-8-methylpyrido[4,3-b]indol-5-yl)-1-p-tolylethanol (1 equiv.) is refluxed with 25% sulfuric acid for 2 h. The reaction mixture is cooled to 5° C. with an ice-water bath. KOH (15% aq. solution) is added dropwise to the reaction mixture until pH 9-10 is achieved. The reaction mixture is extracted with EtOAc. The combined organic layers are washed with water followed by brine, dried over sodium sulfate and evaporated under vacuum. The crude product is purified by column chromatography over silica gel (100-200 mesh) using a gradient of MeOH-EtOAc (0-10%).

Workup

  1. extractionThe reaction mixture is extracted with EtOAc
  2. washThe combined organic layers are washed with water
  3. dry with materialdried over sodium sulfate
  4. customevaporated under vacuum
  5. customThe crude product is purified by column chromatography over silica gel (100-200 mesh)

Sources & evidence

ORD record
ord-9dd2250a45f1498387ea79aedd0ad0ed
Source dataset
uspto-grants-2014_12
Patent number
US08906925B2

Reaction notes

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