Semicarbazide → [(E)-1-[3-[(1-methylindazol-5-yl)methyl]imidazo[1,2-b]pyridazin-6-yl]ethylideneamino]urea

HRID 456157Notes

Reaction equation

HRID 456157 reaction equation
[CH3:1][N:2]1[C:10]2[C:5](=[CH:6][C:7]([CH2:11][C:12]3[N:16]4[N:17]=[C:18]([C:21](=O)[CH3:22])[CH:19]=[CH:20][C:15]4=[N:14][CH:13]=3)=[CH:8][CH:9]=2)[CH:4]=[N:3]1.[NH:24]([C:26]([NH2:28])=[O:27])[NH2:25]>C1COCC1>[CH3:1][N:2]1[C:10]2[C:5](=[CH:6][C:7]([CH2:11][C:12]3[N:16]4[N:17]=[C:18](/[C:21](=[N:25]/[NH:24][C:26]([NH2:28])=[O:27])/[CH3:22])[CH:19]=[CH:20][C:15]4=[N:14][CH:13]=3)=[CH:8][CH:9]=2)[CH:4]=[N:3]1

Participants

4

Reactant 2

HCID 5196SemicarbazideHCID 581905161-(3-((1-Methyl-1H-indazol-5-yl)methyl)imidazo[1,2-b]pyridazin-6-yl)ethanone

Product 1

HCID 71699925[(E)-1-[3-[(1-methylindazol-5-yl)methyl]imidazo[1,2-b]pyridazin-6-yl]ethylideneamino]ureaYield 88.9%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

A solution of 1-(3-((1-methyl-1H-indazol-5-yl)methyl)imidazo[1,2-b]pyridazin-6-yl)ethanone (40.0 mg, 0.09 mmol) and hydrazinecarboxamide (19.47 mg, 0.26 mmol) in 10 mL THF was stirred at 40° C. for overnight. Solvent was removed in vacuo. The crude product was purified on flash chromatography (DCM:MeOH=20:1) to give the title compound as a white solid (29.0 mg, 88%). 1H-NMR (400 MHz, DMSO-d6) δ ppm 9.71 (s, 1H), 8.18 (d, 1H), 7.95 (m, 2H), 7.69 (s, 1H), 7.60 (s, 1H), 7.75 (d, 1H), 7.40 (dd, 1H), 6.76 (bs, 2H), 4.41 (s, 2H), 3.99 (s, 3H), 2.29 (s, 3H). LCMS (method A): [MH]+=363, tR=4.42 min.

Workup

  1. customSolvent was removed in vacuo
  2. customThe crude product was purified on flash chromatography (DCM:MeOH=20:1)

Sources & evidence

ORD record
ord-e90edb6ad4e24c46ae64d35617b67ebe
Source dataset
uspto-grants-2013_07
Patent number
US08497368B2

Reaction notes

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