Water → ethyl 7-tert-butyl-6-methyl-2-(trifluoromethyl)-2H-chromene-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

The ethyl 7-tert-butyl-6-chloro-2-(trifluoromethyl)-2H-chromene-3-carboxylate from Example 8, Step 2 (1 g, 2.75 mmole) was dissolved in diglyme (20 mL). Cs2CO3 (1.5 g, 3.07 mmole), trimethylboroxaine (0.75 mL, 5.36 mmole), and [(t-Bu3P)PdBr]2 (20 mg) were added to above solution. The mixture was heated to 115° C. for 15 hrs under nitrogen. LCMS indicated that there was 50% conversion. The reaction was cooled down and the water was added to quench the reaction. The product was extracted with EtOAc and washed with water. The crude mixture was purified by RPHPLC to give the desired product 360 mg as an oil (38% yield), which had suitable purity to use without further purification.

Provenance & Evidence