Reaktion #1005978

Reaktionsgleichung

6-ethynyl-2,2-dimethylthiochroman-4-one

ethyl 4-iodobenzoate

→

ethyl 4-[(2,2-dimethyl-4-oxo-thiochroman-6-yl)ethynyl]-benzoate

Ausbeute 72.2%

Lösungsmittel

Et3N

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeAfter purging for an additional 5 minutes with argon
2. 2
   FiltrationThe reaction mixture was filtered through a pad of Celite
3. 3
   Waschenwash

Vorschrift

A solution of 6-ethynyl-2,2-dimethylthiochroman-4-one (82.0 mg, 0.38 mmol) and ethyl 4-iodobenzoate (104.9 mg, 0.38 mmol) in 5.0 mL Et3N was purged with argon for 10 minutes. To this solution were added bis(triphenylphosphine)-palladium (II) chloride (88.0 mg, 0.12 mmol) and copper (I) iodide (22.9 mg, 0.12 mmol). After purging for an additional 5 minutes with argon, the solution was stirred overnight at room temperature. The reaction mixture was filtered through a pad of Celite using an Et2O wash. Concentration of the filtrate under reduced pressure, followed by column chromatography of the residual solid, afforded 100 mg (72%) of ethyl 4-[(2,2-dimethyl-4-oxo-thiochroman-6-yl)ethynyl]-benzoate as a yellow solid. 1H NMR (300 MHz, CDCl3) δ: 8.25 (1H, d, J=1.8 Hz), 8.00 (2H, d, J=8.4 Hz), 7.55 (2H, d, J=8.4 Hz), 7.53 (1H, dd, J=1.8, 8.2 Hz), 7.21 (1H, d, J=8.2 Hz), 4.37 (2H, q, J=7.1 Hz), 2.88 (2H, s), 1.47 (6H, s), 1.39 (3H, t, J=7.1 Hz).

Quelle