Thieno(3,2-c)pyridine → 4-(5-Chloro-2,3-dihydrobenzofuran-7-yl)-1,1,1-trifluoro-4-methyl-2-thieno[3,2-c]pyridin-2-ylmethylpentan-2-ol

Participants

Reaction Steps

A solution of thieno[3,2-c]pyridine (prepared according to the procedure by J. H. Wikel, M. L. Denney, and R. T. J. Vasileff, Heterocyclic Chem. 1993, 30, pp. 289-290) (152 mg, 1.12 mmol) in 2 mL of THF was treated with 450 μL of n-BuLi (2.5 M in hexanes) in a dropwise manner at −78° C. The resulting dark reaction mixture was stirred for 30 minutes and treated with a solution of 5-chloro-7-[1,1-dimethyl-2-(2-trifluoromethyloxiranyl)ethyl]-2,3-dihydrobenzofuran (180 mg, 0.561 mmol) in 0.5 mL of THF. The reaction was allowed to warm to room temperature overnight and quenched with a mixture of 5 mL of saturated ammonium chloride solution and 10 mL of ethyl acetate. The phases were separated and the aqueous layer was extracted with three 10 mL portions of ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, and concentrated in vacuo. Flash chromatography (ethyl acetate-hexanes, 20%-30% gradient) gave 33.5 mg (13% yield) of the title product as yellow foam.

Provenance & Evidence