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Triethylamine → 3-Ethyl-2-methoxy-6-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine

HRID 249737
Notes
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Reaction equation

HRID 249737 reaction equation
Br[C:2]1[C:3]([CH3:12])=[N:4][C:5]([O:10][CH3:11])=[C:6]([CH2:8][CH3:9])[CH:7]=1.[CH3:13][C:14]1([CH3:21])[C:18]([CH3:20])([CH3:19])[O:17][BH:16][O:15]1.C(N(CC)CC)C>O1CCOCC1.C(OCC)(=O)C.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[CH2:8]([C:6]1[C:5]([O:10][CH3:11])=[N:4][C:3]([CH3:12])=[C:2]([B:16]2[O:17][C:18]([CH3:20])([CH3:19])[C:14]([CH3:21])([CH3:13])[O:15]2)[CH:7]=1)[CH3:9]
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 3

HCID 8471TriethylamineHCID 27347684,4,5,5-Tetramethyl[1,3,2]dioxaborolaneHCID 116586693-Bromo-5-ethyl-6-methoxy-2-methylpyridine

Product 1

HCID 574164103-Ethyl-2-methoxy-6-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridineYield 72%

Reagents, catalysts & solvents 3

HCID 44119782
Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)
Catalyst
HCID 8857Ethyl AcetateSolvent
HCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

3-Bromo-5-ethyl-6-methoxy-2-methylpyridine (11.51 g, 50 mmol), 4,4,5,5-tetramethyl-1,3,2-dioxaborolane (8.31 g, 64.95 mmol) and triethylamine (21.84 ml, 164.4 mmol) were dissolved under argon in 100 ml of dioxane and then 1,1′bis(diphenylphosphino)ferrocenepalladium(II) chloride (1.94 g, 2.65 mmol) was added. The mixture was stirred at 90° C. for 18 h, cooled and diluted with ethyl acetate, and filtered through silica gel. The solution was cooled to 0° C., mixed with water and extracted twice with ethyl acetate. The dried and concentrated organic phase was chromatographed on silica gel dried at 45° C. in a vacuum drying oven. A pale beige solid (9.94 g, 72%) was obtained.

Workup

  1. temperaturecooled
  2. filtrationfiltered through silica gel
  3. temperatureThe solution was cooled to 0° C.
  4. additionmixed with water
  5. extractionextracted twice with ethyl acetate
  6. customThe dried
  7. customconcentrated organic phase was chromatographed on silica gel
  8. customdried at 45° C. in a vacuum
  9. customdrying oven

Sources & evidence

ORD record
ord-29f3a7413a844905837944ddd07df9aa
Source dataset
uspto-grants-2011_01
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07863280B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes