1,4-Dioxane → 5-(1-tert-butoxycarbonyl-1,2,3,6-tetrahydro-pyridin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester

HRID 513859Notes

Reaction equation

HRID 513859 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[N:7]([S:16]([C:19]2[CH:24]=[CH:23][C:22]([CH3:25])=[CH:21][CH:20]=2)(=[O:18])=[O:17])[C:8]2[C:13]([CH:14]=1)=[CH:12][C:11](Br)=[CH:10][CH:9]=2)=[O:5])[CH3:2].[C:26]([O:30][C:31]([N:33]1[CH2:38][CH:37]=[C:36](B2OC(C)(C)C(C)(C)O2)[CH2:35][CH2:34]1)=[O:32])([CH3:29])([CH3:28])[CH3:27].P([O-])([O-])([O-])=O.[K+].[K+].[K+].O1CCOCC1>[Pd].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.O>[CH2:1]([O:3][C:4]([C:6]1[N:7]([S:16]([C:19]2[CH:24]=[CH:23][C:22]([CH3:25])=[CH:21][CH:20]=2)(=[O:18])=[O:17])[C:8]2[C:13]([CH:14]=1)=[CH:12][C:11]([C:36]1[CH2:37][CH2:38][N:33]([C:31]([O:30][C:26]([CH3:29])([CH3:28])[CH3:27])=[O:32])[CH2:34][CH:35]=1)=[CH:10][CH:9]=2)=[O:5])[CH3:2]

Participants

7

Reactant 4

HCID 312751,4-DioxaneHCID 62657Potassium Phosphate, TribasicHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 135158625-bromo-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester

Product 1

HCID 680056275-(1-tert-butoxycarbonyl-1,2,3,6-tetrahydro-pyridin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester

Reagents, catalysts & solvents 2

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 962WaterSolvent

Conditions

Temperature
80 °C

Procedure

5-Bromo-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester (844 mg, 2.0 mmol), 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester (742 mg, 2.4 mmol), potassium phosphate (848 mg, 4.0 mmol), and tetrakis(triphenylphosphine) palladium (116 mg, 0.1 mmol) were placed into a flask. After deaeration, the air was replaced with nitrogen. Anhydrous dioxane (16 ml) and water (4 ml) were added to the flask, and this was stirred at 80° C. for 15 hours. After cooling it to room temperature, the reaction mixture was filtered through Celite, and then washed with ethyl acetate. The filtrate was concentrated, and the residue obtained by concentration under reduced pressure was purified by silica gel column chromatography. Thus, 5-(1-tert-butoxycarbonyl-1,2,3,6-tetrahydro-pyridin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester was obtained as a colorless amorphous material (1.0 g, 97.2%).

Workup

  1. temperatureAfter cooling it to room temperature
  2. filtrationthe reaction mixture was filtered through Celite
  3. washwashed with ethyl acetate
  4. concentrationThe filtrate was concentrated
  5. customthe residue obtained by concentration under reduced pressure
  6. customwas purified by silica gel column chromatography

Sources & evidence

ORD record
ord-b157c636ef984b3b9137e71bbbed3293
Source dataset
uspto-grants-2015_08
Patent number
US09102692B2

Reaction notes

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