Boron tribromide → 3-(5-(3,4-Dihydroxy-5-nitrophenyl)-1,2,4-triazin-3-yl)-2-(trifluoromethyl)pyridine 1-oxide

HRID 1920076ノート

反応式

HRID 1920076 の反応式
C[O:2][C:3]1[CH:4]=[C:5]([C:14]2[N:15]=[C:16]([C:20]3[C:21]([C:27]([F:30])([F:29])[F:28])=[N+:22]([O-:26])[CH:23]=[CH:24][CH:25]=3)[N:17]=[N:18][CH:19]=2)[CH:6]=[C:7]([N+:11]([O-:13])=[O:12])[C:8]=1[O:9]C.B(Br)(Br)Br>ClCCl>[OH:2][C:3]1[CH:4]=[C:5]([C:14]2[N:15]=[C:16]([C:20]3[C:21]([C:27]([F:28])([F:30])[F:29])=[N+:22]([O-:26])[CH:23]=[CH:24][CH:25]=3)[N:17]=[N:18][CH:19]=2)[CH:6]=[C:7]([N+:11]([O-:13])=[O:12])[C:8]=1[OH:9]

参加物

4

反応物 2

HCID 25134Boron tribromideHCID 67037355HCID 67037355、化合物

生成物 1

HCID 1363780143-(5-(3,4-Dihydroxy-5-nitrophenyl)-1,2,4-triazin-3-yl)-2-(trifluoromethyl)pyridine 1-oxide

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

反応条件

温度
-78 °C

実験手順

3-(5-(3,4-dimethoxy-5-nitrophenyl)-1,2,4-triazin-3-yl)-2-(trifluoromethyl)pyridine 1-oxide (1.27 g, 3 mmol) was taken up in dichloromethane (25 mL). The yellowish solution was cooled to −78° C. under argon and boron tribromide (2.55 mL, 27 mmol) was added dropwise. The red reaction mixture was allowed to warm to room temperature and stirred for 18 hours. It was then carefully poured into ice-water (100 mL) and stirred for 1 hour. The yellow precipitate was filtered off, washed with water and dried over P2O5 under vacuum. The solid was recrystallised from dichloromethane-ethanol to give 3-(5-(3,4-dihydroxy-5-nitrophenyl)-1,2,4-triazin-3-yl)-2-(trifluoromethyl)pyridine 1-oxide as a yellow solid, 0.84 g (71%).

後処理

  1. customThe red reaction mixture
  2. temperatureto warm to room temperature
  3. stirringstirred for 1 hour
  4. filtrationThe yellow precipitate was filtered off
  5. washwashed with water
  6. dry with materialdried over P2O5 under vacuum
  7. customThe solid was recrystallised from dichloromethane-ethanol

出典と根拠

ORDレコード
ord-c034a38093c3478e863845d039bb3b54
出典データセット
uspto-grants-2012_05
特許番号
US08168793B2

反応ノート

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