Pinacol → 5-(1,3-Dioxolan-2-yl)-2-fluoro-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine

HRID 1812141Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1812141
[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[C:6]1[CH:7]=[C:8]([B:13]([OH:15])[OH:14])[C:9]([F:12])=[N:10][CH:11]=1.S([O-])([O-])(=O)=O.[Mg+2].O[C:23]([C:26](O)([CH3:28])[CH3:27])([CH3:25])[CH3:24]>C1(C)C=CC=CC=1>[O:1]1[CH2:5][CH2:4][O:3][CH:2]1[C:6]1[CH:7]=[C:8]([B:13]2[O:15][C:26]([CH3:28])([CH3:27])[C:23]([CH3:25])([CH3:24])[O:14]2)[C:9]([F:12])=[N:10][CH:11]=1

Komponenten

5

Edukt 3

HCID 6425PinacolHCID 24083Sulfuric acid magnesium salt (1:1)HCID 595483675-(1,3-Dioxolan-2-yl)-2-fluoropyridin-3-ylboronic acid

Produkt 1

HCID 595484325-(1,3-Dioxolan-2-yl)-2-fluoro-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridineAusbeute 95,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Versuchsvorschrift

5-(1,3-Dioxolan-2-yl)-2-fluoropyridin-3-ylboronic acid (14.56 g, 68.4 mmol) was suspended in PhMe (300 mL) and anhydrous magnesium sulfate (41.223 g, 342 mmol) and pinacol (8.27 g, 70.0 mmol) were added. The reaction was stirred under nitrogen at room temperature over the weekend. The suspension was filtered, and the solid was washed with EtOAc. The filtrate was washed with brine (2×200 mL), and the organic phase was dried over sodium sulfate, filtered, concentrated and dried to give 19.19 g of 5-(1,3-dioxolan-2-yl)-2-fluoro-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine as a light yellow powder. 1H NMR (CDCl3, 400 MHz) δ 8.39 (d, J=2.54 Hz, 1H); 8.28 (dd, J=8.02 Hz, 2.54 Hz, 1H); 5.84 (s, 1H); 4.17-4.04 (m, 4H); 1.37 (s, 12H).

Aufarbeitung

  1. filtrationThe suspension was filtered
  2. washthe solid was washed with EtOAc
  3. washThe filtrate was washed with brine (2×200 mL)
  4. dry with materialthe organic phase was dried over sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customdried

Quellen und Nachweise

ORD-Eintrag
ord-5fb35fa314594e28841d51184b9be16e
Quelldatensatz
uspto-grants-2013_01
Patentnummer
US08362241B2

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