Réaction #554629

Équation de réaction

6-methoxynaphthalen-2-ylboronic acid

tri-o-tolylphosphine

K3PO4

ethylbromoacetate

→

ethyl 2-(6-methoxynaphthalen-2-yl)acetate

Rendement 76.3%

Solvants

THF

EtOAc

Water

Conditions de réaction

Traitement

1. 1
   workup.STIRRINGthe mixture was stirred for 1 h
2. 2
   AutreThe layers were separated
3. 3
   ExtractionThe aqueous layer was extracted with EtOAc
4. 4
   Lavagewashed with brine
5. 5
   Séchagedried over anhydrous sodium sulfate
6. 6
   Filtrationfiltered
7. 7
   Autreevaporated
8. 8
   Autreto afford a crude material, which
9. 9
   Lavagewas subjected to silica gel chromatography (gradient elution 0% to 20% EtOAc in hexanes)

Mode opératoire

Into a 1 L round bottomed flask containing THF (335 mL) was added 6-methoxynaphthalen-2-ylboronic acid (20.15 g, 99.7 mmol, 1.2 eq), Pd(OAc)2 (563 mg, 2.51 mmol, 0.03 eq), tri-o-tolylphosphine (2.3 g, 7.56 mmol, 0.09 eq), K3PO4 (89 g, 419 mmol, 5 eq), and ethylbromoacetate (9.2 mL, 82.6 mmol, 1 eq). The resulting mixture was stirred for 24 h at room temperature. Water and EtOAc were added to the reaction and the mixture was stirred for 1 h. The layers were separated and both were saved. The aqueous layer was extracted with EtOAc. The organic layers were combined, washed with brine, dried over anhydrous sodium sulfate, filtered, and evaporated to afford a crude material, which was subjected to silica gel chromatography (gradient elution 0% to 20% EtOAc in hexanes) to afford ethyl 2-(6-methoxynaphthalen-2-yl)acetate (15.4 g, 76%) as a white, crystalline solid.

Source