N-Iodosuccinimide → 8-(1-Ethyl-propyl)-3-iodo-2,6-dimethyl-imidazo[1,2-b]pyridazine

HRID 226007Notes

Reaction equation

[CH2:1]([CH:3]([C:6]1[C:7]2[N:8]([CH:13]=[C:14]([CH3:16])[N:15]=2)[N:9]=[C:10]([CH3:12])[CH:11]=1)[CH2:4][CH3:5])[CH3:2].C1C(=O)N([I:24])C(=O)C1>C(#N)C.C(OCC)(=O)C>[CH2:1]([CH:3]([C:6]1[C:7]2[N:8]([C:13]([I:24])=[C:14]([CH3:16])[N:15]=2)[N:9]=[C:10]([CH3:12])[CH:11]=1)[CH2:4][CH3:5])[CH3:2]

Participants

Conditions

Temperature: 0 °C

Procedure

In nitrogen-purged flask is added 5.1 g (0.023 moles) of 8-(1-ethyl-propyl)-2,6-dimethyl-imidazo[1,2-b]pyridazine in 50 ml dry acetonitrile. Cool to 0° C. and add 5.54 g (0.025 moles) of NIS dissolved in 90 ml dry acetonitrile. Allow bath to come to room temperature and the reaction to stir overnight. Evaporate solvents, take up in ethyl acetate and wash two times with 50% aqueous solution of sodium sulfate then brine. Dry over sodium sulfate, filter and evaporate to a residue. Triturate in small amount of acetonitrile and filter solid. Repeat several times to obtain the title compound as light tan solid weighing 7.29 g (0.021 moles, 91.3%). 1H-NMR (DMSO-d6): δ 6.96 (s, 1H); 3.0-3.3 (m, 1H); 2.51 (s, 3H); 2.35 (s, 3H); 1.71-1.80 (m, 4H); 0.71 (t, J=7.48 hz, 6H) ppm. MS/ES+=344 (100%, M+1).

Workup

customIn nitrogen-purged flask
customto come to room temperature
customthe reaction
washwash two times with 50% aqueous solution of sodium sulfate
dry with materialDry over sodium sulfate
filtrationfilter
customevaporate to a residue
customTriturate in small amount of acetonitrile
filtrationfilter solid

Sources & evidence

ORD record: ord-ccbbb5f2e8c34ddda9a511301a2acb80
Source dataset: uspto-grants-2009_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07557103B2

Reaction notes

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