反応式
[Cl:1][C:2]1[C:3]([N:8]2[CH2:13][CH2:12][NH:11][CH2:10][CH2:9]2)=[N:4][CH:5]=[CH:6][N:7]=1.[CH3:14][N:15]1[CH:19]=[C:18]([CH:20]=O)[CH:17]=[N:16]1.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>O1CCCC1>[Cl:1][C:2]1[C:3]([N:8]2[CH2:9][CH2:10][N:11]([CH2:20][C:18]3[CH:17]=[N:16][N:15]([CH3:14])[CH:19]=3)[CH2:12][CH2:13]2)=[N:4][CH:5]=[CH:6][N:7]=1参加物
実験手順
Dissolve 3′-chloro-3,4,5,6-tetrahydro-2H-[1,2′]bipyrazinyl (3.43 g, 17.3 mmol) in tetrahydrofuran (100 mL). Add 1-methyl-1H-pyrazole-4-carbaldehyde (2.244 g, 20.38 mmol) in dry tetrahydrofuran (5 mL), stir for 10 min. at room temperature, add sodium triacetoxyborohydride (4.32 g, 20.4 mmol) and subject the reaction to ultrasound stirring for 6 hr. at room temperature. Add saturated aqueous sodium hydrogen carbonate (100 mL) then 2 N sodium hydroxide (10 mL) to the mixture and extract with DCM (2×200 mL). Pass the combined DCM extracts through an IST Phase Separator Frit®, concentrate and purify (silica gel chromatography, eluting with 0:100 to 8:92 methanol:DCM), to give the title preparation as a crystalline solid (5.21 g, 92%). MS (ES): m/z=293.1 [M+H]+.
後処理
- customthe reaction
- customat room temperature
- extractionAdd saturated aqueous sodium hydrogen carbonate (100 mL) then 2 N sodium hydroxide (10 mL) to the mixture and extract with DCM (2×200 mL)
- concentrationconcentrate
- custompurify
- wash(silica gel chromatography, eluting with 0:100 to 8:92 methanol:DCM)
- customto give the title
出典と根拠
- ORDレコード
- ord-cf81399f6b664e0cbccab945fd1dbf2c
- 出典データセット
- uspto-grants-2012_06
- 特許番号
- US08202873B2
関連ノート
読み込み中…