1,4-Dioxane → Ethyl 1-[(6-chloropyridin-3-yl)methyl]-4-thioxo-1,4-dihydropyrido[2,3-c]pyridazine-3-carboxylate

HRID 2067105Notes

Reaction equation

[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][N:9]2[C:14]3[N:15]=[CH:16][CH:17]=[CH:18][C:13]=3[C:12](=O)[C:11]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[N:10]2)=[CH:4][CH:3]=1.O1CCOCC1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:40])=CC=1>C1(C)C=CC=CC=1>[Cl:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][N:9]2[C:14]3[N:15]=[CH:16][CH:17]=[CH:18][C:13]=3[C:12](=[S:40])[C:11]([C:20]([O:22][CH2:23][CH3:24])=[O:21])=[N:10]2)=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 110 °C

Procedure

Ethyl 1-[(6-chloropyridin-3-yl)methyl]-4-oxo-1,4-dihydropyrido[2,3-c]pyridazine-3-carboxylate (490 mg, 1.42 mmol) was suspended in toluene (5 mL) and dioxane (5 mL) and placed into a preheated oil bath at 110° C. The mixture was treated with Lawesson's Reagent (316 mg, 0.782 mmol, 0.55 equiv) portionwise over 45 minutes and stirred for an addition 30 minutes at 110° C. The mixture was cooled to ambient temperature and concentrated in vacuo. The residue was purified by silica gel gradient chromatography (100:0 to 50:50; hexanes:ethyl acetate), providing the titled compound as a brown foam.

Workup

temperatureThe mixture was cooled to ambient temperature
concentrationconcentrated in vacuo
customThe residue was purified by silica gel gradient chromatography (100:0 to 50:50; hexanes:ethyl acetate)

Sources & evidence

ORD record: ord-d42331565ed1428c95dec5f6ef1e02ea
Source dataset: uspto-grants-2012_10
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08293744B2

Reaction notes

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