反応式
C([Li])(CC)C.[F:6][C:7]1[CH:12]=[CH:11][C:10]([F:13])=[CH:9][CH:8]=1.[N:14]1[CH:19]=[C:18]2[C:20]([O:22][C:23](=[O:24])[C:17]2=[CH:16][N:15]=1)=[O:21].[Cl-].[NH4+]>O1CCCC1>[F:6][C:7]1[CH:12]=[CH:11][C:10]([F:13])=[CH:9][C:8]=1[C:20]([C:18]1[C:17]([C:23]([OH:24])=[O:22])=[CH:16][N:15]=[N:14][CH:19]=1)=[O:21]参加物
反応条件
- 温度
- -80 °C
実験手順
Sec-butyllithium (1.32 M in cyclohexane; 1.25 mL) is added dropwise via syringe over 0.25 h to a stirred solution of 1,4-difluorobenzene (0.162 g) in tetrahydrofuran (THF) (5 mL) at -84° C. under a nitrogen atmosphere. The yellow mixture is stirred for an additional 45 min at -80° C. and then added via a canula over 5 min to a stirred solution of pyridazine 4,5-dicarboxylic acid anhydride (0.22 g; prepared according to J.Het Chem. 14, 1099, (1977)) in THF at -80° C. by nitrogen pressure. The mixture is warmed to room temperature overnight and neutralized with amonium chloride. After removal of THF at reduced pressure the resultant tan solid is treated with an aqueous sodium bicarbonate solution (10 mL) and washed with diethyl ether (10 mL). The aqueous phase is acidified with aqueous hydrochloric acid. The precipitate is collected by filtration, washed with cold water (3×10 mL) and dried to give 4-(2',5'-difluorobenzoyl)pyridazine-5-carboxylic acid (0.23 g) as an off-white solid, m.p. 202°-205° C.
後処理
- customAfter removal of THF at reduced pressure the resultant tan solid
- additionis treated with an aqueous sodium bicarbonate solution (10 mL)
- washwashed with diethyl ether (10 mL)
- filtrationThe precipitate is collected by filtration
- washwashed with cold water (3×10 mL)
- customdried
出典と根拠
- ORDレコード
- ord-0e9afc5dc40845d1a58a356be22fd549
- 出典データセット
- uspto-grants-1997_01
- 特許番号
- US05596097
関連ノート
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