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Lithium hexamethyldisilazane → 4-(2-fluoro-4-(methylthio)phenylamino)-1-methyl-6-oxo-N-(2-(vinyloxy)ethoxy)-1,6-dihydropyridazine-3-carboxamide

HRID 15960
Notes
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Reaction equation

HRID 15960 reaction equation
[F:1][C:2]1[CH:7]=[C:6]([S:8][CH3:9])[CH:5]=[CH:4][C:3]=1[NH:10][C:11]1[C:12]([C:19]([O:21]C)=O)=[N:13][N:14]([CH3:18])[C:15](=[O:17])[CH:16]=1.[CH:23]([O:25][CH2:26][CH2:27][O:28][NH2:29])=[CH2:24].[Li+].C[Si]([N-][Si](C)(C)C)(C)C>C1COCC1>[F:1][C:2]1[CH:7]=[C:6]([S:8][CH3:9])[CH:5]=[CH:4][C:3]=1[NH:10][C:11]1[C:12]([C:19]([NH:29][O:28][CH2:27][CH2:26][O:25][CH:23]=[CH2:24])=[O:21])=[N:13][N:14]([CH3:18])[C:15](=[O:17])[CH:16]=1
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 2733832Lithium hexamethyldisilazaneHCID 21867017O-(2-(Vinyloxy)ethyl)hydroxylamineHCID 66673411Methyl 4-(2-fluoro-4-(methylthio)phenylamino)-1-methyl-6-oxo-1,6-dihydropyridazine-3-carboxylate

Product 1

HCID 866016154-(2-fluoro-4-(methylthio)phenylamino)-1-methyl-6-oxo-N-(2-(vinyloxy)ethoxy)-1,6-dihydropyridazine-3-carboxamideYield 99%

Reagents, catalysts & solvents 1

HCID 8028
Tetrahydrofuran
Solvent

Procedure

To a solution of methyl 4-(2-fluoro-4-(methylthio)phenylamino)-1-methyl-6-oxo-1,6-dihydropyridazine-3-carboxylate (25 mg, 0.077 mmol) and O-(2-vinyloxy-ethyl)-hydroxylamine (24 mg, 0.23 mmol) in THF (2 mL) at 0° C. was added LiHMDS (0.54 mL, 0.54 mmol, 1 M in THF). The reaction mixture was warmed to room temperature and stirred for 1 hour. The reaction mixture was quenched with saturated aqueous NaHCO3 and diluted with EtOAc. The organic layer was washed with brine, dried over MgSO4, filtered, and concentrated under reduced pressure to give the crude material that was purified by silica gel flash column chromatography (100% CH2Cl2 to 1.5% MeOH in CH2Cl2) to afford 30 mg (99%) of the desired product.

Workup

  1. customThe reaction mixture was quenched with saturated aqueous NaHCO3
  2. additiondiluted with EtOAc
  3. washThe organic layer was washed with brine
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customto give the crude material that
  8. customwas purified by silica gel flash column chromatography (100% CH2Cl2 to 1.5% MeOH in CH2Cl2)

Sources & evidence

ORD record
ord-3b25464ef122462787f2fbae1dbb57ee
Source dataset
uspto-grants-2010_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07732616B2

Reaction notes

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