Trimethylsilylacetylene → 3-((Trimethylsilyl)ethynyl)imidazo[1,2-b]pyridazine

HRID 1640485Notes

Reaction equation

HRID 1640485 reaction equation
Br[C:2]1[N:6]2[N:7]=[CH:8][CH:9]=[CH:10][C:5]2=[N:4][CH:3]=1.[C:11]([Si:13]([CH3:16])([CH3:15])[CH3:14])#[CH:12].C(N(C(C)C)CC)(C)C>CN(C=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH3:14][Si:13]([C:11]#[C:12][C:2]1[N:6]2[N:7]=[CH:8][CH:9]=[CH:10][C:5]2=[N:4][CH:3]=1)([CH3:16])[CH3:15]

Participants

6

Reactant 3

HCID 66111TrimethylsilylacetyleneHCID 81531DiisopropylethylamineHCID 128723193-Bromoimidazo(1,2-b)pyridazine

Product 1

HCID 667355693-((Trimethylsilyl)ethynyl)imidazo[1,2-b]pyridazineYield 71.1%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Procedure

A mixture of 3-bromoimidazo[1,2-b]pyridazine (36.78 g, 0.186 mol; prepared according to Stanovnik, B. et al. Synthesis (1981), 12, 987-989), ethynyltrimethylsilane (21.89 g, 0.223 mol), Pd(PPh3)4 (10.73 g, 9.29 mmol), Cul (5.30 g, 0.028 mol), and diisopropylethylamine (32.4 mL, 0.279 mol) in 150 mL of DMF was stirred at ambient temperature, under an atmosphere of N2, for 1 h. The reaction mixture was concentrated and the crude product was purified by silica gel flash chromatography (eluted with 0-5% MeOH/DCM) to provide 28.46 g of product.

Workup

  1. concentrationThe reaction mixture was concentrated
  2. customthe crude product was purified by silica gel flash chromatography (eluted with 0-5% MeOH/DCM)

Sources & evidence

ORD record
ord-dfd9f559f5ad455db8326a9995fee093
Source dataset
uspto-grants-2012_02
Patent number
US08114874B2

Reaction notes

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