Chlorosuccinimide → Ethyl 2-benzyl-7-chloro-4-(4-fluorophenyl)pyrrolo[1,2-b]pyridazine-3-carboxylate

HRID 860434Notes

Reaction equation

[CH2:1]([C:8]1[C:9]([C:24]([O:26][CH2:27][CH3:28])=[O:25])=[C:10]([C:17]2[CH:22]=[CH:21][C:20]([F:23])=[CH:19][CH:18]=2)[C:11]2[N:12]([CH:14]=[CH:15][CH:16]=2)[N:13]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Cl:29]N1C(=O)CCC1=O>O1CCCC1>[CH2:1]([C:8]1[C:9]([C:24]([O:26][CH2:27][CH3:28])=[O:25])=[C:10]([C:17]2[CH:22]=[CH:21][C:20]([F:23])=[CH:19][CH:18]=2)[C:11]2[N:12]([C:14]([Cl:29])=[CH:15][CH:16]=2)[N:13]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 20 °C

Procedure

To a solution of ethyl 2-benzyl-4-(4-fluorophenyl)pyrrolo[1,2-b]pyridazine-3-carboxylate (730 mg) in tetrahydrofuran (10 ml) was added N-chlorosuccinimide (260 mg) and the mixture was stirred at 20° C. for 2 hours. The mixture was partitioned between ethyl acetate and water. The organic layer was separated, washed with aqueous sodium thiosulfate, water and brine, dried over magnesium sulfate, and evaporated. The residue was purified by silica gel column chromatograpy eluting with a mixture of toluene and ethyl acetate (10:1) to give ethyl 2-benzyl-7-chloro-4-(4-fluorophenyl)pyrrolo[1,2-b]pyridazine-3-carboxylate (285 mg) as an yellow oil.

Workup

customThe mixture was partitioned between ethyl acetate and water
customThe organic layer was separated
washwashed with aqueous sodium thiosulfate, water and brine
dry with materialdried over magnesium sulfate
customevaporated
customThe residue was purified by silica gel column chromatograpy
washeluting with a mixture of toluene and ethyl acetate (10:1)

Sources & evidence

ORD record: ord-485202b65913475ebddc8398b7853b4f
Source dataset: uspto-grants-2006_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07153854B2

Reaction notes

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