Boron tribromide → 2-Methylquinazolin-8-ol

HRID 726315노트

반응식

HRID 726315 반응식
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

참가 물질

5

반응물 3

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

생성물 1

HCID 106070502-Methylquinazolin-8-ol수율 88.5%

시약·촉매·용매 1

HCID 6344Dichloromethane용매2회

실험 절차

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.

후처리

  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

출처 및 근거

ORD 기록
ord-34464962893744379272bce58471d843
출처 데이터셋
uspto-grants-1998_01
특허 번호
US05708173

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