N-bromobutanimide → (E)-4-bromo-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester

HRID 19381

반응식

HRID 19381 반응식
[CH2:1]([O:3][C:4](=[O:20])/[CH:5]=[C:6](/[O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][C:16]([OH:19])([CH3:18])[CH3:17])=[CH:11][CH:10]=1)\[CH3:7])[CH3:2].[Br:21]N1C(=O)CCC1=O.N(C(C)(CC(C)C)C#N)=NC(C)(CC(C)C)C#N>ClCCl>[CH2:1]([O:3][C:4](=[O:20])/[CH:5]=[C:6](/[O:8][C:9]1[CH:10]=[CH:11][C:12]([CH2:15][C:16]([OH:19])([CH3:18])[CH3:17])=[CH:13][CH:14]=1)\[CH2:7][Br:21])[CH3:2]

참가 물질

5

반응물 3

HCID 67184N-bromobutanimideHCID 915372,2'-Azobis(2,4-dimethylvaleronitrile)HCID 66895133(E)-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester

생성물 1

HCID 66895616(E)-4-bromo-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester

시약·촉매·용매 1

HCID 6344Dichloromethane용매

실험 절차

A solution of (E)-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester (0.500 g, 1.80 mmol) in dichloromethane (40 mL) was treated with N-bromosuccinimide (0.350 g, 1.97 mmol) and 2,2′-azobis(2,4′-dimethylvaleronitrile) (0.045 g, 0.18 mmol) under nitrogen. The mixture was then refluxed for 5 h, cooled and concentrated in vacuo. The residue was purified by flash column chromatography (silica gel, 0% to 30% ethyl acetate/hexanes) to afford the intermediate (E)-4-bromo-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester. A solution of (E)-4-bromo-3-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-but-2-enoic acid ethyl ester in acetonitrile (20 mL) was immediately treated with (L)-leucine methyl ester hydrochloride (0.21 g, 2.17 mmol) and N,N-diisopropylethylamine (0.510 g, 3.95 mmol). The resulting mixture was sealed in a tube and heated at 90° C. overnight and then cooled and partitioned between ethyl acetate and water. The organic layer was collected, dried over sodium sulfate, filtered and concentrated in vacuo. The residue was dissolved in tetrahydrofuran (approximately 5 mL) and heated at 160° C., for 6 h in a sealed tube. At this time, the reaction was cooled to room temperature and concentrated in vacuo. The residue was purified by flash column chromatography (silica gel, 30% to 100% ethyl acetate/hexanes) to afford, (S)-2-{4-[4-(2-hydroxy-2-methyl-propyl)-phenoxy]-2-oxo-2,5-dihydro-pyrrol-1-yl}-4-methyl-pentanoic acid methyl ester (0.180 g, 27%) as a waxy off-white solid.

후처리

  1. temperatureThe mixture was then refluxed for 5 h
  2. temperaturecooled
  3. concentrationconcentrated in vacuo
  4. customThe residue was purified by flash column chromatography (silica gel, 0% to 30% ethyl acetate/hexanes)

출처 및 근거

ORD 기록
ord-2e015e8881d34ab8ae7140903b17b2e2
출처 데이터셋
uspto-grants-2010_06
특허 번호
US07741327B2

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