Sodium Carbonate → HCID 89996003, Verbindung

Temperatur

70 °C

To a suspension of methyl 2-(benzyloxy)-5-bromoisonicotinate (Preparation 84, 1.5 g, 4.66 mmol), (E)-2-(2-ethoxyvinyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (Preparation 29, 1.844 g, 9.31 mmol) and Na2CO3 (0.99 g, 9.31 mmol) in toluene (5 mL), EtOH (5 mL) and water (5 mL) was added Pd(PPh3)4 (377 mg, 0.326 mmol). The reaction mixture was heated to 70° C. for 18 hours, under nitrogen. The reaction mixture was diluted with EtOAc (75 mL) and water (75 mL). The organic layer was dried (MgSO4) and concentrated in vacuo. The residue was purified by silica gel column chromatography eluting with 0-10% EtOAc in cyclohexane to give the title compound (1.2 g, 82%). 1H NMR (500 MHz, CDCl3): δ 8.23 (s, 1H), 7.47 (d, J=7.5, 1.5 Hz, 2H), 7.39 (td, J=8.5, 2.5 Hz, 2H), 7.33 (m, 1H), 7.24 (s, 1H), 6.80 (d, J=13.0 Hz, 1H), 6.39 (d, J=13.0 Hz, 1H), 5.40 (s, 2H), 3.95 (q, J=7.5 Hz, 2H), 3.92 (s, 3H), 1.37 (t, J=7.5 Hz, 3H).

1. dry with materialThe organic layer was dried (MgSO4)
2. concentrationconcentrated in vacuo
3. customThe residue was purified by silica gel column chromatography
4. washeluting with 0-10% EtOAc in cyclohexane

ORD-Eintrag

ord-839eef05f767498e87a2b25f34772537

Quelldatensatz

uspto-grants-2016_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09409907B2