Ethyl propiolate → Ethyl 4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-2-carboxylate
反応式
[C:1]([O:5][CH2:6][CH3:7])(=[O:4])[C:2]#[CH:3].[NH:8]1[N:12]2[CH2:13][CH2:14][CH2:15][CH2:16][CH:11]2C(=O)O1>CC1C=CC=CC=1C>[CH2:6]([O:5][C:1]([C:2]1[CH:3]=[C:11]2[CH2:16][CH2:15][CH2:14][CH2:13][N:12]2[N:8]=1)=[O:4])[CH3:7]参加物
4
実験手順
Ethyl propiolate (804 mg) was added to the o-xylene (15 mL) solution of tetrahydropyridino[1,2-c][1,2,3]oxadiazolone (1.04 g) under a nitrogen atmosphere and refluxed for 16 h. The solution was concentrated under a reduced pressure. The residue was applied to silica gel column chromatography, then the column was eluted with n-hexane-AcOEt (2/1-1/1). The titled compound was obtained as yellow oil (871 mg, 65%), and 4,5,6,7-tetrahydropyrazolo[1,5-a]pyridine-3-carboxylic acid ethyl ester was obtained as yellow oil (345 mg, 26%).
後処理
- temperaturerefluxed for 16 h
- concentrationThe solution was concentrated under a reduced pressure
- washthe column was eluted with n-hexane-AcOEt (2/1-1/1)
出典と根拠
- ORDレコード
- ord-4ee70bce93f14af8a09c2eb5e29e75d7
- 出典データセット
- uspto-grants-2010_10
- 特許番号
- US07812014B2
反応ノート
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