Acetic Acid → 2-bromo-1-[3-methyl-1-(propan-2-yl)-1H-1,2,4-triazol-5-yl]ethan-1-one

HRID 1530462노트

반응식

HRID 1530462 반응식
C([O:3][C:4]([C:6]1[N:7]([CH:12]([CH3:14])[CH3:13])[N:8]=[C:9]([CH3:11])[N:10]=1)=O)C.[Br:15][CH2:16]Br.C[Li].C(O)(=O)C>C1COCC1.O>[Br:15][CH2:16][C:4]([C:6]1[N:7]([CH:12]([CH3:14])[CH3:13])[N:8]=[C:9]([CH3:11])[N:10]=1)=[O:3]

참가 물질

7

반응물 4

HCID 176Acetic AcidHCID 3024DibromomethaneHCID 582047541H-1,2,4-Triazole-5-carboxylic acid, 3-methyl-1-(1-methylethyl)-, ethyl esterHCID 178418348HCID 178418348, 화합물

생성물 1

HCID 582048242-bromo-1-[3-methyl-1-(propan-2-yl)-1H-1,2,4-triazol-5-yl]ethan-1-one

시약·촉매·용매 2

HCID 962Water용매HCID 8028Tetrahydrofuran용매

반응 조건

온도
-78 °C

실험 절차

To a solution of 2-isopropyl-5-methyl-2H-[1,2,4]triazole-3-carboxylic acid ethyl ester (12.09 g, 61.3 mmol) and dibromomethane (8.63 mL, 122.6 mmol) in THF (500 mL) at −78° C. was added methyllithium (40.9 mL, 122.6 mmol, 3M solution in diethoxymethane) dropwise. The reaction mixture was stirred at −78° C. for 15 min. Acetic acid (3 mL) was added and the reaction mixture allowed to warm to RT. The reaction mixture was diluted with water and extracted with ethyl acetate (3×30 mL). The combined organic extracts were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 0-100% ethyl acetate in cyclohexane) to give 2-Bromo-1-(2-isopropyl-5-methyl-2H-[1,2,4]triazol-3-yl)-ethanone as a colorless oil which crystallised on standing (11.26 g, 75%). 1H NMR 400 MHz (CDCl3) δ: 5.41 (1H, sept, J=6.6 Hz), 4.67 (2H, s), 2.44 (3H, s), 1.49 (6H, d, J=6.6 Hz)

후처리

  1. temperatureto warm to RT
  2. extractionextracted with ethyl acetate (3×30 mL)
  3. washThe combined organic extracts were washed with brine
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated in vacuo

출처 및 근거

ORD 기록
ord-fddb634a9c0549f79bdda893b193b3c5
출처 데이터셋
uspto-grants-2015_07
특허 번호
US09090628B2

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