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Triisopropyl borate → (5-(((tert-Butyldimethylsilyl)oxy)methyl)pyridin-3-yl)boronic acid

HRID 599457
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HRID 599457 반응식
[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([CH2:8][O:9][Si:10]([C:13]([CH3:16])([CH3:15])[CH3:14])([CH3:12])[CH3:11])[CH:7]=1.[B:17](OC(C)C)([O:22]C(C)C)[O:18]C(C)C.C([Li])CCC.[Cl-].[NH4+]>C1COCC1.O>[Br:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([CH2:8][O:9][Si:10]([C:13]([CH3:16])([CH3:15])[CH3:14])([CH3:11])[CH3:12])[CH:7]=1.[Si:10]([O:9][CH2:8][C:6]1[CH:7]=[C:2]([B:17]([OH:22])[OH:18])[CH:3]=[N:4][CH:5]=1)([C:13]([CH3:16])([CH3:15])[CH3:14])([CH3:12])[CH3:11]
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참가 물질

8

반응물 4

HCID 21531Triisopropyl borateHCID 25517Ammonium ChlorideHCID 219840913-Bromo-5-(((tert-butyldimethylsilyl)oxy)methyl)pyridineHCID 178418339Butyllithium

생성물 2

HCID 219840913-Bromo-5-(((tert-butyldimethylsilyl)oxy)methyl)pyridineHCID 21984252(5-(((tert-Butyldimethylsilyl)oxy)methyl)pyridin-3-yl)boronic acid
수율 143.4%

시약·촉매·용매 2

HCID 962Water용매HCID 8028Tetrahydrofuran용매

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온도
-20 °C

실험 절차

3-Bromo-5-(tert-butyldimethylsilanyloxymethyl)pyridine was prepared according to the published procedure (Zhang, N. et al, J. Med. Chem., 45, 2832-2840 (2002)). Under a nitrogen atmosphere, a solution of 3-bromo-5-(tert-butyldimethylsilanyloxymethyl)pyridine (28.70 g, 94.94 mmol) and triisopropyl borate (26.3 mL, 114 mmol) in dry THF was cooled to −70° C. n-Butyllithium (45.6 mL, 114 mmol) was added dropwise over a period of 1.5 hours. The reaction was stirred for an additional 30 minutes and then allowed to warm to −20° C. Dilute aqueous ammonium chloride was added, and the mixture was allowed to warm to ambient temperature. The aqueous layer was separated and extracted with diethyl ether. The combined organic fractions were concentrated under reduced pressure, and methanol was added to the resulting oil. A solid formed, which was stirred with water for two days, isolated by filtration, and dried under reduced pressure to provide 18.19 g of 5-(tert-butyldimethylsilanyloxymethyl)pyridine-3-boronic acid as a white solid.

후처리

  1. additionwas added dropwise over a period of 1.5 hours
  2. temperatureto warm to ambient temperature
  3. customThe aqueous layer was separated
  4. extractionextracted with diethyl ether
  5. concentrationThe combined organic fractions were concentrated under reduced pressure, and methanol
  6. additionwas added to the resulting oil
  7. customA solid formed
  8. customisolated by filtration
  9. customdried under reduced pressure

출처 및 근거

ORD 기록
ord-2e60ae61b83048c6b9a61865faebcc5b
출처 데이터셋
uspto-grants-2011_03
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US07897767B2

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