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Ethyl Acetate → 4-Quinoxalin-6-yl-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

HRID 1038145
Notes
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Reaction equation

HRID 1038145 reaction equation
Br[C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[CH:7][CH:6]=[N:5]2.[C:12]([O:16][C:17]([N:19]1[CH2:24][CH:23]=[C:22](B2OC(C)(C)C(C)(C)O2)[CH2:21][CH2:20]1)=[O:18])([CH3:15])([CH3:14])[CH3:13].C(=O)([O-])[O-].[Na+].[Na+].C(OC(=O)C)C>O1CCOCC1.C(O)C.O.[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>[C:12]([O:16][C:17]([N:19]1[CH2:20][CH:21]=[C:22]([C:2]2[CH:3]=[C:4]3[C:9](=[CH:10][CH:11]=2)[N:8]=[CH:7][CH:6]=[N:5]3)[CH2:23][CH2:24]1)=[O:18])([CH3:15])([CH3:13])[CH3:14]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 8857Ethyl AcetateHCID 10340Sodium CarbonateHCID 6109396-BromoquinoxalineHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylate

Product 1

HCID 576862004-Quinoxalin-6-yl-3,6-dihydro-2H-pyridine-1-carboxylic acid tert-butyl ester

Reagents, catalysts & solvents 2

HCID 11979704Tetrakis(triphenylphosphine)palladiumCatalystHCID 69104347Dioxane ethanol waterSolvent

Conditions

Temperature
160 °C

Procedure

A solution containing 6-bromo-quinoxaline (417 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 (600 mg, 1.94 mmol), tetrakis [triphenylphosphine] palladium (108 mg, 0.1 mmol) and sodium carbonate (2 M solution, 3 mL) in 5 mL of dioxane/ethanol/water (7:3:1) was heated at 160° C. using microwave reactor for 15 minutes. After the reaction, ethylacetate was added and the mixture was filtered, washed with water. After concentration under vacuum, the product was purified using column chromatography (5% methanol in dichloromethane)

Workup

  1. customfor 15 minutes
  2. additionwas added
  3. filtrationthe mixture was filtered
  4. washwashed with water
  5. concentrationAfter concentration under vacuum
  6. customthe product was purified

Sources & evidence

ORD record
ord-deeeb938f15845adb91322ee86c4da9c
Source dataset
uspto-grants-2013_10
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08546404B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes