Boron tribromide → 2-Methylquinazolin-8-ol

HRID 726315ノート

反応式

HRID 726315 の反応式
C[O:2][C:3]1[CH:4]=[CH:5][CH:6]=[C:7]2[C:12]=1[N:11]=[C:10]([CH3:13])[N:9]=[CH:8]2.B(Br)(Br)Br.C(=O)([O-])O.[Na+]>ClCCl>[OH:2][C:3]1[CH:4]=[CH:5][CH:6]=[C:7]2[C:12]=1[N:11]=[C:10]([CH3:13])[N:9]=[CH:8]2

参加物

5

反応物 3

HCID 25134Boron tribromideHCID 516892Sodium BicarbonateHCID 107735698-Methoxy-2-methylquinazoline

生成物 1

HCID 106070502-Methylquinazolin-8-ol収率 88.5%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒2 回

実験手順

To a solution of 8-methoxy-2-methylquinazoline (1.50 g) in dichloromethane (10 ml) was added 1M solution of boron tribromide in dichloromethane (12.9 ml) at 3°-5° C. After 10 minutes, the reaction mixture was stirred at ambient temperature for 2 days. The mixture was adjusted to pH 7 with saturated sodium hydrogen carbonate, and extracted with dichloromethane twice. The organic layer was dried over anhydrous magnesium sulfate, filtered and evaporated in vacuo. The residue was crystallized from n-hexane to give 8-hydroxy-2-methylquinazoline (1.22 g) as colorless crystals.

後処理

  1. extractionextracted with dichloromethane twice
  2. dry with materialThe organic layer was dried over anhydrous magnesium sulfate
  3. filtrationfiltered
  4. customevaporated in vacuo
  5. customThe residue was crystallized from n-hexane

出典と根拠

ORDレコード
ord-34464962893744379272bce58471d843
出典データセット
uspto-grants-1998_01
特許番号
US05708173

反応ノート

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