Hydrogen Bromide → 5-Bromo-7-fluoro-2,3-dihydrobenzo[b][1,4]dioxine

HRID 1476767노트

반응식

HRID 1476767 반응식
N([O-])=O.[Na+].[F:5][C:6]1[CH:7]=[C:8](N)[C:9]2[O:14][CH2:13][CH2:12][O:11][C:10]=2[CH:15]=1.[BrH:17]>O>[Br:17][C:8]1[C:9]2[O:14][CH2:13][CH2:12][O:11][C:10]=2[CH:15]=[C:6]([F:5])[CH:7]=1

참가 물질

5

반응물 3

HCID 260Hydrogen Bromide2회HCID 23668193Sodium NitriteHCID 666806007-Fluoro-2,3-dihydro-1,4-benzodioxin-5-amine

생성물 1

HCID 896359545-Bromo-7-fluoro-2,3-dihydrobenzo[b][1,4]dioxine

시약·촉매·용매 1

HCID 962Water용매

실험 절차

NaNO2 (2.69 g, 39.9 mmol) in water (20 mL) was added slowly at 0° C. to a solution of 7-fluoro-2,3-dihydrobenzo[b][1,4]dioxin-5-amine (4.5 g, 26 mmol) in aq.47% HBr (20 mL) and continued stirring at same temperature for 30 min. The above diazonium salt solution was added slowly to a solution of CuBr (5.7 g, 39.9 mmol) in aq.47% HBr (25 mL) at 0° C. and stirred at 25° C. for 30 min. Reaction mixture was quenched with ice water, extracted with ethyl acetate (3×50 mL), washed it with water followed by brine, dried over anhydrous sodium sulphate and concentrated under reduced pressure to afford crude. The crude was purified by column purification (using silica gel and 0-5% ethyl acetate in Hexane as eluent) to afford 5-bromo-7-fluoro-2,3-dihydrobenzo[b][1,4]dioxine (Int-53) (5.9 g). 1H NMR (300 MHz, CDCl3) δ ppm 6.9-6.84 (1H, dd), 6.6-6.5 (1H, dd), 4.3-4.3 (4H, m).

후처리

  1. customReaction mixture
  2. customwas quenched with ice water
  3. extractionextracted with ethyl acetate (3×50 mL)
  4. washwashed it with water
  5. dry with materialdried over anhydrous sodium sulphate
  6. concentrationconcentrated under reduced pressure
  7. customto afford crude
  8. customThe crude was purified by column purification (using silica gel and 0-5% ethyl acetate in Hexane as eluent)

출처 및 근거

ORD 기록
ord-759071f72133440188873ed5c99f1a60
출처 데이터셋
uspto-grants-2016_08
특허 번호
US09402833B2

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