[5-Chloro-6-oxo-1-(tetrahydro-pyran-2-yl)-1,6-dihydro-pyridazin-4-yl]-(2-trifluoromethyl-phenyl)-acetonitrile → 4-chloro-5-(2-trifluoromethyl-benzyl)-2H-pyridazin-3-one

関与物質

反応条件

反応手順

A mixture of [5-chloro-6-oxo-1-(tetrahydro-pyran-2-yl)-1,6-dihydro-pyridazin-4-yl]-(2-trifluoromethyl-phenyl)-acetonitrile (550 mg, 1.38 mmol) in concentrated hydrochloric acid (8.4 mL), glacial acetic acid (2.1 mL) and water (2.1 mL) (4:1:1, 0.11 M) was heated to 120° C. overnight. After this time, the reaction was cooled to 25° C. and then poured onto ice, followed by rinsing with minimal water. The resulting aqueous mixture was brought to pH=4-5 by treatment with a 4N aqueous sodium hydroxide solution. The resulting tan solids were collected by filtration. The solids were subsequently washed with water (2×10 mL) and dried in vacuo to afford 4-chloro-5-(2-trifluoromethyl-benzyl)-2H-pyridazin-3-one (0.24 g, 62%) as a tan solid; ES+-HRMS m/e calcd for C12H8N2OF3Cl [M+H+] 289.0350, found 289.0350.

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