Triethylamine → 2-[(E)-1-[3-[1-(6-fluoro-1-methylindazol-5-yl)ethyl]imidazo[1,2-b]pyridazin-6-yl]ethylideneamino]oxyethanol

HRID 1959711Notes

Reaction equation

HRID 1959711 reaction equation
[F:1][C:2]1[CH:10]=[C:9]2[C:5]([CH:6]=[N:7][N:8]2[CH3:11])=[CH:4][C:3]=1[CH:12]([C:14]1[N:18]2[N:19]=[C:20]([C:23](=O)[CH3:24])[CH:21]=[CH:22][C:17]2=[N:16][CH:15]=1)[CH3:13].Cl.[NH2:27][O:28][CH2:29][CH2:30][OH:31].C(N(CC)CC)C>CO>[OH:31][CH2:30][CH2:29][O:28]/[N:27]=[C:23](/[C:20]1[CH:21]=[CH:22][C:17]2[N:18]([C:14]([CH:12]([C:3]3[CH:4]=[C:5]4[C:9](=[CH:10][C:2]=3[F:1])[N:8]([CH3:11])[N:7]=[CH:6]4)[CH3:13])=[CH:15][N:16]=2)[N:19]=1)\[CH3:24]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 22507086Ethanol, 2-(aminooxy)-, hydrochlorideHCID 581905981-(3-(1-(6-Fluoro-1-methyl-1H-indazol-5-yl)ethyl)imidazo[1,2-b]pyridazin-6-yl)ethanone

Product 1

HCID 509915362-[(E)-1-[3-[1-(6-fluoro-1-methylindazol-5-yl)ethyl]imidazo[1,2-b]pyridazin-6-yl]ethylideneamino]oxyethanolYield 18%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Conditions

Temperature
30 °C

Procedure

To a solution of 1-(3-(1-(6-fluoro-1-methyl-1H-indazol-5-yl)ethyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (100 mg, 0.267 mmol) in methanol (10 mL) was added 2-(aminooxy)ethanol hydrochloride (30.3 mg, 0.267 mmol). Triethyl amine was added dropwise to adjust the pH to 5˜6. The reaction mixture was stirred at 30° C. for 20 h. The solvent was removed in vacuo and the residue was dissolved in DCM, washed with NaHCO3 (aq) and brine. The organic layer was dried over Na2SO4 and concentrated in vacuo to afford the crude product which was purified by chromatography on silica gel to afford 19 mg (17%) of the title compound. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.01 (d, 1H), 7.91 (s, 1H), 7.77 (s, 1H), 7.58 (d, 1H), 7.50 (s, 1H), 7.49 (d, 1H), 4.91 (q, 1H), 4.76 (t, 1H), 4.20 (t, 2H), 3.95 (s, 3H), 3.65 (m, 2H), 2.13 (s, 3H), 1.76 (d, 3H). LCMS (method B): [MH]+=397, tR=2.50 min. Chiral separation (method K) provided enantiomeric pure compounds example 39-R and example 39-S.

Workup

  1. customThe solvent was removed in vacuo
  2. dissolutionthe residue was dissolved in DCM
  3. washwashed with NaHCO3 (aq) and brine
  4. dry with materialThe organic layer was dried over Na2SO4
  5. concentrationconcentrated in vacuo
  6. customto afford the crude product which
  7. customwas purified by chromatography on silica gel

Sources & evidence

ORD record
ord-be4e8ddf55174eb091cf71bd843f1969
Source dataset
uspto-grants-2013_04
Patent number
US08410264B2

Reaction notes

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