Cesium carbonate → tert-Butyl 4-(5-(thiophen-2-yl)tetrazolo[1,5-a]pyrazin-8-yl)piperazine-1-carboxylate

HRID 1045734ノート

反応式

HRID 1045734 の反応式
Br[C:2]1[N:7]2[N:8]=[N:9][N:10]=[C:6]2[C:5]([N:11]2[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13][CH2:12]2)=[N:4][CH:3]=1.[S:24]1[CH:28]=[CH:27][CH:26]=[C:25]1B(O)O.C([O-])([O-])=O.[Cs+].[Cs+].O1CCOCC1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[S:24]1[CH:28]=[CH:27][CH:26]=[C:25]1[C:2]1[N:7]2[N:8]=[N:9][N:10]=[C:6]2[C:5]([N:11]2[CH2:16][CH2:15][N:14]([C:17]([O:19][C:20]([CH3:23])([CH3:22])[CH3:21])=[O:18])[CH2:13][CH2:12]2)=[N:4][CH:3]=1

参加物

7

反応物 4

HCID 10796Cesium carbonateHCID 312751,4-DioxaneHCID 27339602-Thiopheneboronic acidHCID 58447025Tert-butyl 4-(5-bromotetrazolo[1,5-a]pyrazin-8-yl)piperazine-1-carboxylate

生成物 1

HCID 58447033tert-Butyl 4-(5-(thiophen-2-yl)tetrazolo[1,5-a]pyrazin-8-yl)piperazine-1-carboxylate収率 70%

試薬・触媒・溶媒 2

HCID 178418397HCID 178418397、化合物触媒HCID 962Water溶媒

反応条件

温度
80 °C

実験手順

A 1 L round bottom flask was charged with tert-butyl 4-(5-bromotetrazolo[1,5-a]pyrazin-8-yl)piperazine-1-carboxylate (50 g, 0.13 mol), thiophene-2-boronic acid (22 g, 0.17 mol), tetrakis(triphenylphosphine)palladium(0) (7.5 g, 6.5 mmol), Cs2CO3 (51 g, 0.16 mol), 1,4-dioxane (600 mL) and H2O (240 mL). After the air was purged by bubbling N2 into the solution, the resulting solution was stirred at 80° C. under N2 for 10 h. Work-up: the reaction mixture was concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluted with CH2Cl2, and then crystallized from methanol, to afford 35 g (70%) of the product as a yellow solid. MS m/z: 388 (M+H+).

後処理

  1. customAfter the air was purged
  2. customby bubbling N2 into the solution
  3. concentrationthe reaction mixture was concentrated in vacuo
  4. customThe residue was purified by flash column chromatography on silica gel
  5. washeluted with CH2Cl2
  6. customcrystallized from methanol

出典と根拠

ORDレコード
ord-0c9a4c57868b432cb99a875432e257bc
出典データセット
uspto-grants-2013_10
特許番号
US08569300B2

反応ノート

読み込み中…