Potassium Carbonate → tert-butyl 3-(4-ethoxy-4-oxobutyl)-4-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazole-1-carboxylate

HRID 1628404노트

반응식

HRID 1628404 반응식
[CH2:1]([CH:3]([C:6]1[C:14]2[NH:13][C:12](=[O:15])[N:11]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:10]=2[CH:9]=[CH:8][CH:7]=1)[CH2:4][CH3:5])[CH3:2].C(=O)([O-])[O-].[K+].[K+].Br[CH2:30][CH2:31][CH2:32][C:33]([O:35][CH2:36][CH3:37])=[O:34]>CN(C)C=O>[CH2:36]([O:35][C:33](=[O:34])[CH2:32][CH2:31][CH2:30][N:13]1[C:14]2[C:6]([CH:3]([CH2:4][CH3:5])[CH2:1][CH3:2])=[CH:7][CH:8]=[CH:9][C:10]=2[N:11]([C:16]([O:18][C:19]([CH3:20])([CH3:22])[CH3:21])=[O:17])[C:12]1=[O:15])[CH3:37]

참가 물질

5

반응물 3

HCID 11430Potassium CarbonateHCID 76300Ethyl 4-bromobutyrateHCID 67272646tert-Butyl 4-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazole-1-carboxylate

생성물 1

HCID 68763140tert-butyl 3-(4-ethoxy-4-oxobutyl)-4-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazole-1-carboxylate수율 135.2%

시약·촉매·용매 1

HCID 6228Dimethylformamide용매

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온도
85 °C

실험 절차

To a solution of tert-butyl 4-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazole-1-carboxylate (Reference Example 7; 10.37 g, 34.11 mmol) in N,N-dimethylformamide (100 mL) was added potassium carbonate (5.18 g, 37.52 mmol) and ethyl 4-bromobutyrate (8.55 g, 37.52 mmol), and the mixture was stirred at 80-90° C. overnight. The reaction solution was concentrated to dryness and diluted with water (150 mL). The resulting mixture was extracted with ethyl acetate (100 mL×2). The combined extracts were washed with water (80 mL×2), brine (100 mL), dried over anhydrous sodium sulfate and concentrated in vacuo to give 19.3 g of crude tert-butyl 3-(4-ethoxy-4-oxobutyl)-4-(1-ethylpropyl)-2-oxo-2,3-dihydro-1H-benzimidazole-1-carboxylate, which was used for the next step without further purification.

후처리

  1. concentrationThe reaction solution was concentrated to dryness
  2. additiondiluted with water (150 mL)
  3. extractionThe resulting mixture was extracted with ethyl acetate (100 mL×2)
  4. washThe combined extracts were washed with water (80 mL×2), brine (100 mL)
  5. dry with materialdried over anhydrous sodium sulfate
  6. concentrationconcentrated in vacuo

출처 및 근거

ORD 기록
ord-7242b243b9134ee4b5b349282d4173f6
출처 데이터셋
uspto-grants-2014_07
특허 번호
US08785460B2

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