2-Bromo-4'-methylacetophenone → 2-(4-Methylphenyl)-6-nitroimidazo[1,2-a]pyridine

HRID 35517

반응식

HRID 35517 반응식
Br[CH2:2][C:3]([C:5]1[CH:10]=[CH:9][C:8]([CH3:11])=[CH:7][CH:6]=1)=O.[NH2:12][C:13]1[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][N:14]=1>C(O)CC.ClCCl>[CH3:11][C:8]1[CH:9]=[CH:10][C:5]([C:3]2[N:12]=[C:13]3[CH:18]=[CH:17][C:16]([N+:19]([O-:21])=[O:20])=[CH:15][N:14]3[CH:2]=2)=[CH:6][CH:7]=1

참가 물질

5

반응물 2

HCID 692722-Bromo-4'-methylacetophenoneHCID 778882-Amino-5-nitropyridine

생성물 1

HCID 8523592-(4-Methylphenyl)-6-nitroimidazo[1,2-a]pyridine수율 23%

시약·촉매·용매 2

HCID 10311-Propanol용매HCID 6344Dichloromethane용매

실험 절차

81 g (0.38 mole) of 1-bromo-2-(4-methylphenyl)-2-ethanone and 53 g (0.38 mole) of 2-amino-5-nitropyridine are reacted in 900 ml of n-propanol. The solution is maintained under reflux, the reaction being followed by thin layer chromatography. When there is no further change, the mixture is evaporated to dryness. The residue is taken up with water and treated with ammonia solution until the pH>8. The insoluble material is filtered off and dried, and then treated with dichloromethane. The insoluble portion is recrystallized in ethyl acetate, which yields a first crop. The mother liquors are then combined with the portion soluble in dichloromethane, the mixture is concentrated and a second crop of product is obtained. The two crops are purified separately by chromatography. 22 g (23%) of yellow solid are obtained overall. M.p. 205°-206° C.

후처리

  1. temperatureThe solution is maintained
  2. temperatureunder reflux
  3. customthe mixture is evaporated to dryness
  4. additiontreated with ammonia solution until the pH>8
  5. filtrationThe insoluble material is filtered off
  6. customdried
  7. additiontreated with dichloromethane
  8. customThe insoluble portion is recrystallized in ethyl acetate
  9. customwhich yields a first crop
  10. concentrationthe mixture is concentrated
  11. customa second crop of product is obtained
  12. customThe two crops are purified separately by chromatography

출처 및 근거

ORD 기록
ord-d1b684744fdd42abbc927fc9f2d2c369
출처 데이터셋
uspto-grants-1988_08
특허 번호
US04767755

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