Sodium Carbonate → HCID 69519412, compound

Participants

Reaction Conditions

Reaction Steps

The ethyl 7-(bromomethyl)-6-chloro-2-(trifluoromethyl)-2H-chromene-3-carboxylate from Example 16, Step 3 (2.0 g, 5.0 mmole) was dissolved in DME (10.8 mL). The thien-3-ylboronic acid (127.96 mg, 5.0 mmole) was added to above solution and followed by addition of Pd(PPh3)4 (40 mg). After addition of 2M Na2CO3 (5.0 mL), the reaction was heated to 60-70° C. The color of the reaction changed from yellow to red and back to yellow. The solution was heated to reflux for 2 hrs. Additional 107 mg of thien-3-ylboronic acid and Pd(PPh3)4 (8 mg) were added to above mixture. After 2 hsr, the reaction was diluted with 5 ml of water and extracted with EtOAc. The organic layer was washed with NaHCO3 (sat.) and dried over MgSO4 and filtered. The filtrate was concentrated to afford the title ester. The ester (dark oil) was purified by chromatography eluted with 5 to 10% EtOAc in Hexane to give 620 mg, which had suitable purity to use without further purification.

Provenance & Evidence