Dimethylformamide → 2-Amino-4-chloro-3,5-difluorobenzaldehyde

HRID 413042노트

반응식

HRID 413042 반응식
C([Li])CCC.Br[C:7]1[CH:13]=[C:12]([F:14])[C:11]([Cl:15])=[C:10]([F:16])[C:8]=1[NH2:9].CN(C)[CH:19]=[O:20].[Cl-].[NH4+]>O1CCCC1>[NH2:9][C:8]1[C:10]([F:16])=[C:11]([Cl:15])[C:12]([F:14])=[CH:13][C:7]=1[CH:19]=[O:20]

참가 물질

6

반응물 4

HCID 6228DimethylformamideHCID 25517Ammonium ChlorideHCID 27732546-Bromo-3-chloro-2,4-difluoroanilineHCID 178418339Butyllithium

생성물 1

HCID 185232552-Amino-4-chloro-3,5-difluorobenzaldehyde

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

반응 조건

온도
-75 °C

실험 절차

66 cm3 of a 2 N butyllithium solution (in hexane) was added dropwise over 30 minutes to a stirred solution of 13.4 g of 2-bromo-5-chloro-4,6-difluoroaniline in 150 cm3 of anhydrous tetrahydrofuran (THF) cooled to a temperature in the region of −75° C. After stirring for 1 hour at this temperature, 12.8 cm3 of dimethylformamide was added. After the addition, the mixture was again stirred for 3 hours at a temperature in the region of −70° C. The mixture was brought to a temperature in the region of −5° C., and then an aqueous ammonium chloride solution (18 g dissolved in 180 cm3) was added. The reaction mixture was extracted twice with 200 cm of diethyl ether. The combined ethereal extracts were washed once with 150 cm3 of water and once with 150 cm3 of a saturated aqueous sodium chloride solution. After drying over magnesium sulphate, the solution was concentrated under reduced pressure (5 kPa), at a temperature in the region of 40° C. After taking up the solid residue obtained in 80 cm3 of hexane and then filtration, 6.2 g of 2-amino-4-chloro-3,5-difluorobenzaldehyde was obtained in the form of a yellow solid.

후처리

  1. additionwas added
  2. additionAfter the addition
  3. customwas brought to a temperature in the region of −5° C.
  4. extractionThe reaction mixture was extracted twice with 200 cm of diethyl ether
  5. washThe combined ethereal extracts were washed once with 150 cm3 of water and once with 150 cm3 of a saturated aqueous sodium chloride solution
  6. dry with materialAfter drying over magnesium sulphate
  7. concentrationthe solution was concentrated under reduced pressure (5 kPa), at a temperature in the region of 40° C
  8. customobtained in 80 cm3 of hexane
  9. filtrationfiltration

출처 및 근거

ORD 기록
ord-783ef24bebeb4f4da11c27fa097d7783
출처 데이터셋
uspto-grants-2003_05
특허 번호
US06566362B2

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