Potassium Carbonate → 2-[5-Chloro-6-oxo-1-(tetrahydro-pyran-2-yl)-1,6-dihydro-pyridazin-4-yloxy]-benzonitrile

Participants

Reaction Conditions

Reaction Steps

A solution of 4,5-dichloro-2-(tetrahydropyran-2-yl)-2H-pyridazin-3-one (Intermediate 20, 60 g, 0.24 mol) in acetonitrile (500 mL) was treated with potassium carbonate (35.2 g, 0.26 mol) and 2-hydroxy-benzonitrile (29 g, 0.24 mol). The resulting reaction mixture was heated at reflux for 2 h and then allowed to cool to 25° C. The reaction mixture was then partitioned between water and methylene chloride. The organics were washed with a saturated aqueous sodium chloride solution, dried over sodium sulfate, filtered, rinsed, and concentrated in vacuo to afford 2-[5-chloro-6-oxo-1-(tetrahydro-pyran-2-yl)-1,6-dihydro-pyridazin-4-yloxy]-benzonitrile (79 g, 99%); ESI-MS 332 [M+H+]; HPLC: >99% (purity). 1H-NMR (300 MHz, CDCl3) δ 7.74-7.76 (m, 1H), 7.58-7.64 (m, 2H), 7.31-7.34 (m, 1H), 6.07-6.10 (d, 1H), 4.12-4.16 (d, 1H), 3.73-3.80 (t, 1H), 2.15-1.60 (m, 6H).

Provenance & Evidence