Reaktion #91911

Reaktionsgleichung

5-oxo-5,6,7,8-tetrahydronaphthalen-2-yl trifluoromethanesulfonate

3,6-dihydro-2H-pyran-4-boronic acid pinacol ester

NaHCO3

→

title compound

Ausbeute 86.0%

6-(3,6-dihydro-2H-pyran-4-yl)-1,2,3,4-tetrahydronaphthalen-1-one

Ausbeute 86.0%

Lösungsmittel

EtOAc

dioxane

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture was cooled to rt
2. 2
   Filtrationfiltered
3. 3
   Einengenconcentrated
4. 4
   SonstigeThe residue was purified by silica gel chromatography (PE:EtOAc=4:1)

Vorschrift

To a solution of 5-oxo-5,6,7,8-tetrahydronaphthalen-2-yl trifluoromethanesulfonate (1.4 g, 4.76 mmol) in dioxane (6 mL) was added 3,6-dihydro-2H-pyran-4-boronic acid pinacol ester (1.0 g, 4.76 mmol), Pd(dppf)Cl2DCM (408 mg, 0.5 mmol) and sat. NaHCO3 solution (2 mL). The mixture was stirred at 100° C. for 2 h under nitrogen. The mixture was cooled to rt and diluted with EtOAc, filtered, and concentrated. The residue was purified by silica gel chromatography (PE:EtOAc=4:1) to give 930 mg (86%) of the title compound as yellow solid. 1H NMR (400 MHz, CDCl3): δ 2.13-2.16 (2H, m), 2.53 (2H, s), 2.65 (2H, t, J=6.4 Hz), 2.96 (2H, t, J=6.0 Hz), 3.94 (2H, t, J=5.6 Hz), 4.34 (2H, s), 6.26 (1H, s), 7.25 (1H, d, J=5.6 Hz), 7.33 (1H, d, J=8.4 Hz), 7.99 (1H, d, J=8.0 Hz). [M+H] Calc'd for C15H16O2, 229. Found, 229.

Quelle