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2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane → Tert-butyl(3,5-difluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)dimethylsilane

HRID 879101
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HRID 879101 반응식
[C:1]([Si:5]([O:8][C:9]1[CH:14]=[C:13]([F:15])[CH:12]=[C:11]([F:16])[CH:10]=1)([CH3:7])[CH3:6])([CH3:4])([CH3:3])[CH3:2].C([Li])CCC.C(O[B:26]1[O:30][C:29]([CH3:32])([CH3:31])[C:28]([CH3:34])([CH3:33])[O:27]1)(C)C>C1COCC1>[C:1]([Si:5]([O:8][C:9]1[CH:10]=[C:11]([F:16])[C:12]([B:26]2[O:30][C:29]([CH3:32])([CH3:31])[C:28]([CH3:34])([CH3:33])[O:27]2)=[C:13]([F:15])[CH:14]=1)([CH3:7])[CH3:6])([CH3:4])([CH3:2])[CH3:3]
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5

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HCID 50177412-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolaneHCID 66652543Tert-butyl(3,5-difluorophenoxy)dimethylsilaneHCID 178418339Butyllithium

생성물 1

HCID 66655007Tert-butyl(3,5-difluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)dimethylsilane수율 91%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran
용매

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온도
-78 °C

실험 절차

To a solution of tert-butyl(3,5-difluorophenoxy)dimethylsilane (1.0 eq) in dry THF (0.2 M) under an atmosphere of N2 at −78° C. was added n-butyllithium (1 eq, 1.6 M in hexanes) slowly keeping the internal temperature below −65° C. The reaction was stirred for 1 hr at −78° C., followed by the addition of 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2.1 eq). The reaction was allowed to warm to room temperature. Upon completion, the reaction was quenched with NaHCO3 (sat.) and extracted with EtOAc. The organics were washed with brine, dried over Na2SO4, filtered and concentrated to yield tert-butyl(3,5-difluoro-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy)dimethylsilane in 91% yield. 1H NMR (400 MHz, <cdcl3>) δ ppm 0.21 (s, 6H) 0.97 (s, 9H) 1.37 (s, 12H) 6.33 (d, J=9.39 Hz, 2H).

후처리

  1. customthe internal temperature below −65° C
  2. temperatureto warm to room temperature
  3. customUpon completion, the reaction was quenched with NaHCO3 (sat.)
  4. extractionextracted with EtOAc
  5. washThe organics were washed with brine
  6. dry with materialdried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated

출처 및 근거

ORD 기록
ord-89b886942bb0431b8042cff01ddd8bce
출처 데이터셋
uspto-grants-2015_03
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US08987457B2

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