Ammonia → (S)-4-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzamide

HRID 1755366Notes

Reaction equation

HRID 1755366 reaction equation
[CH3:1][C@H:2]1[CH2:6][CH2:5][CH2:4][N:3]1[C:7]1[N:12]=[C:11]([NH:13][C:14]2[C:15]3[N:16]([CH:29]=[CH:30][N:31]=3)[N:17]=[C:18]([C:20]3[CH:28]=[CH:27][C:23]([C:24]([OH:26])=O)=[CH:22][CH:21]=3)[CH:19]=2)[CH:10]=[CH:9][CH:8]=1.C1C=CC2N(O)N=[N:38]C=2C=1.CCN(CC)CC.CCN=C=NCCCN(C)C.N>ClCCl.O1CCOCC1>[CH3:1][C@H:2]1[CH2:6][CH2:5][CH2:4][N:3]1[C:7]1[N:12]=[C:11]([NH:13][C:14]2[C:15]3[N:16]([CH:29]=[CH:30][N:31]=3)[N:17]=[C:18]([C:20]3[CH:21]=[CH:22][C:23]([C:24]([NH2:38])=[O:26])=[CH:27][CH:28]=3)[CH:19]=2)[CH:10]=[CH:9][CH:8]=1

Participants

8

Reactant 5

HCID 222AmmoniaHCID 8471TriethylamineHCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 86682726(S)-4-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoic acid

Product 1

HCID 71526168(S)-4-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzamideYield 47%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 312751,4-DioxaneSolvent

Procedure

To a stirred solution of (S)-4-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzoic acid (90 mg), HOBT (49 mg, 0.365 mmol), Et3N (49 mg, 0.486 mmol) and EDCI (70 mg, 0.365 mmol) in dichloromethane (20 mL) and dioxane (100 mL) was bubbled NH3 gas until saturation and the mixture stirred for 16 h at room temperature. The mixture was filtered and the filtrate concentrated in vacuo. The residue was purified by chromatography (silica gel, 10 g, 200-300 mesh, MeOH:dichloromethane=1:50) to afford (S)-4-(8-(6-(2-methylpyrrolidin-1-yl)pyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)benzamide (38 mg, 47%) as a yellow solid. 1H NMR (300 MHz, CD3OD): δ 8.74 (s, 1H), 7.94-7.86 (m, 5H), 7.49 (s, 1H), 7.32 (t, 1H, J=8.1 Hz), 6.18 (d, 1H, J=6.0 Hz), 5.98 (d, 1H, J=8.4 Hz), 4.17-4.14 (m, 1H), 3.55-3.49 (m, 1H), 3.38-3.32 (m, 1H), 2.07-1.93 (m, 3H), 1.68 (s, 1H), 1.10 (d, 3H, J=6.0 Hz). LC-MS: [M+H]+, 414, tR=1.505 min, HPLC: 97.48% at 214 nm, 97.67% at 254 nm, tR=6.027 min.

Workup

  1. filtrationThe mixture was filtered
  2. concentrationthe filtrate concentrated in vacuo
  3. customThe residue was purified by chromatography (silica gel, 10 g, 200-300 mesh, MeOH:dichloromethane=1:50)

Sources & evidence

ORD record
ord-a7078a335ca64650a189f65ec50c6387
Source dataset
uspto-grants-2015_10
Patent number
US09169259B2

Reaction notes

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