Trifluoroacetic acid → 4-(1-(8-(5,6-Dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoic acid

HRID 1755405Notes

Reaction equation

HRID 1755405 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([NH:11][C:12]2[C:13]3[N:14]([CH:39]=[CH:40][N:41]=3)[N:15]=[C:16]([N:18]3[CH2:22][CH2:21][CH:20]([C:23]([NH:25][C:26]4[CH:38]=[CH:37][C:29]([C:30]([O:32]C(C)(C)C)=[O:31])=[CH:28][CH:27]=4)=[O:24])[CH2:19]3)[CH:17]=2)=[N:7][C:8]=1[O:9][CH3:10].C(O)(C(F)(F)F)=O>ClCCl>[CH3:1][O:2][C:3]1[CH:4]=[CH:5][C:6]([NH:11][C:12]2[C:13]3[N:14]([CH:39]=[CH:40][N:41]=3)[N:15]=[C:16]([N:18]3[CH2:22][CH2:21][CH:20]([C:23]([NH:25][C:26]4[CH:38]=[CH:37][C:29]([C:30]([OH:32])=[O:31])=[CH:28][CH:27]=4)=[O:24])[CH2:19]3)[CH:17]=2)=[N:7][C:8]=1[O:9][CH3:10]

Participants

4

Reactant 2

HCID 6422Trifluoroacetic acidHCID 86682747Tert-butyl 4-(1-(8-(5,6-dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoate

Product 1

HCID 715265314-(1-(8-(5,6-Dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoic acidYield 4%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

A mixture of tert-butyl 4-(1-(8-(5,6-dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoate (200 mg, 0.36 mmol) and TFA (2 mL) in dichloromethane (2 mL) was stirred at room temperature for 2 h. The residue was concentrated in vacuo. The crude product was purified by prep-HPLC (Gemini 5u C18 150×21.2 mm; inject volume: 3 mL/inj, flow rate: 20 mL/min; wavelength: 214 nm and 254 nm; gradient conditions: 25% acetonitrile/75% water (0.1% TFA, v/v) initially, proceeding to 50% acetonitrile/50% water (0.1% TFA, v/v) in a linear fashion over 9 min) to give 4-(1-(8-(5,6-dimethoxypyridin-2-ylamino)imidazo[1,2-b]pyridazin-6-yl)pyrrolidine-3-carboxamido)benzoic acid (6 mg, 4%) as a yellow solid. 1H NMR (300 MHz, DMSO): δ 10.54 (s, 1H), 8.88 (brs, 2H), 7.95-7.82 (m, 4 h), 7.49-6.69 (m, 3H), 4.06-3.57 (m, 6H), 3.19-3.02 (m, 5H), 2.05 (brs, 2H). LC-MS: [M+H]+, 504, tR=1.269 min, HPLC: 96.47% at 214 nm, 97.69% at 254 nm, tR=4.72 min.

Workup

  1. concentrationThe residue was concentrated in vacuo
  2. customThe crude product was purified by prep-HPLC (Gemini 5u C18 150×21.2 mm
  3. waitgradient conditions: 25% acetonitrile/75% water (0.1% TFA, v/v) initially, proceeding to 50% acetonitrile/50% water (0.1% TFA, v/v) in a linear fashion over 9 min

Sources & evidence

ORD record
ord-d6ad23ee10e74053be36ed23e30bf01b
Source dataset
uspto-grants-2015_10
Patent number
US09169259B2

Reaction notes

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