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Carbon tetrabromide → Tert-butyl [2-(2-bromoethyl)-2,3-dihydro-2,4,6,7-tetramethylbenzofuran-5-yl]carbamate

HRID 565664
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HRID 565664 반응식
O[CH2:2][CH2:3][C:4]1([CH3:24])[CH2:8][C:7]2[C:9]([CH3:23])=[C:10]([NH:15][C:16](=[O:22])[O:17][C:18]([CH3:21])([CH3:20])[CH3:19])[C:11]([CH3:14])=[C:12]([CH3:13])[C:6]=2[O:5]1.C(Br)(Br)(Br)[Br:26].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1>O1CCCC1>[Br:26][CH2:2][CH2:3][C:4]1([CH3:24])[CH2:8][C:7]2[C:9]([CH3:23])=[C:10]([NH:15][C:16](=[O:22])[O:17][C:18]([CH3:21])([CH3:20])[CH3:19])[C:11]([CH3:14])=[C:12]([CH3:13])[C:6]=2[O:5]1
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참가 물질

5

반응물 3

HCID 11205Carbon tetrabromideHCID 11776TriphenylphosphineHCID 54463969Tert-butyl [2,3-dihydro-2-(2-hydroxyethyl)-2,4,6,7-tetramethylbenzofuran-5-yl]carbamate

생성물 1

HCID 54438432Tert-butyl [2-(2-bromoethyl)-2,3-dihydro-2,4,6,7-tetramethylbenzofuran-5-yl]carbamate수율 82%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran
용매

실험 절차

To a solution of tert-butyl [2,3-dihydro-2-(2-hydroxyethyl)-2,4,6,7-tetramethylbenzofuran-5-yl]carbamate (7.7 g) and carbon tetrabromide (8.0 g) in tetrahydrofuran (80 mL) was added 6.3 g of triphenylphosphine under ice-cooling and the mixture was stirred for 30 minutes. This reaction mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate=97:3 to 4:1) to provide 7.5 g of the title compound. Yield 82%.

후처리

  1. temperaturecooling
  2. filtrationThis reaction mixture was filtered
  3. concentrationthe filtrate was concentrated under reduced pressure
  4. customThe residue was purified by silica gel column chromatography (hexane/ethyl acetate=97:3 to 4:1)

출처 및 근거

ORD 기록
ord-7eda659980da4537aa82588395baa004
출처 데이터셋
uspto-grants-2001_01
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US06172085B2

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