Acetic Acid → 4-Bromo-5,6,7,8-tetrahydroisoquinolin-8-OL

HRID 530369ノート

反応式

HRID 530369 の反応式
[Br:1][C:2]1[C:11]2[CH2:10][CH2:9][CH2:8][C:7](=[O:12])[C:6]=2[CH:5]=[N:4][CH:3]=1.[BH4-].[Na+].CC(O)=O>CO>[Br:1][C:2]1[C:11]2[CH2:10][CH2:9][CH2:8][CH:7]([OH:12])[C:6]=2[CH:5]=[N:4][CH:3]=1

参加物

5

反応物 3

HCID 176Acetic AcidHCID 4311764Sodium borohydrideHCID 717433804-Bromo-6,7-dihydro-8(5H)-isoquinolinone

生成物 1

HCID 717438914-Bromo-5,6,7,8-tetrahydroisoquinolin-8-OL収率 92%

試薬・触媒・溶媒 1

HCID 887Methanol溶媒

反応条件

温度
0 °C

実験手順

A suspension of 4-bromo-6,7-dihydroisoquinolin-8(5H)-one (intermediate A-2 [C]) (2.135 g, 9.44 mmol) in MeOH (18.9 mL) was cooled to 0° C. and treated with NaBH4 (357 mg, 9.44 mmol) in 5 portions over 30 min. The reaction was stirred for ¾ h at 0° C., then AcOH was added dropwise until a pH ˜5-6 was obtained and the reaction mixture was evaporated. The residue was diluted with water and poured into aq. sat. NaHCO3-solution, then extracted with EtOAc (3×). The organic layers are washed once with aq. sat. NaHCO3 and aq. 10% NaCl solution, dried over Na2SO4 and concentrated in vacuo. The residue was precipitated with CH2Cl2/n-pentane to afford the title compound (1.98 g, 92%) as dark brown viscous oil. MS: 227 (M+, 1Br).

後処理

  1. customwas obtained
  2. customthe reaction mixture was evaporated
  3. additionThe residue was diluted with water
  4. additionpoured into aq. sat. NaHCO3-solution
  5. extractionextracted with EtOAc (3×)
  6. washThe organic layers are washed once with aq. sat. NaHCO3 and aq. 10% NaCl solution
  7. dry with materialdried over Na2SO4
  8. concentrationconcentrated in vacuo
  9. customThe residue was precipitated with CH2Cl2/n-pentane

出典と根拠

ORDレコード
ord-72e64597de804e79a639fa30212405e9
出典データセット
uspto-grants-2016_05
特許番号
US09353081B2

反応ノート

読み込み中…