Hydrochloric Acid → HCID 12990911, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 5-bromobenzofuran-2-carboxylate 15 (1.0 g, 3.7 mmole), 3-thiopheneboronic acid (0.52 g, 4.1 mmole), tetrakis(triphenylphosphine)palladium (0) (47 mg), sodium carbonate (1.30 g, 12.3 mmole) in water (10 ml), and dioxane (10 ml) was stirred under an atmosphere of argon and heated to 100° C. for 24 hrs. The mixture was cooled, acidified with 1 M HCl, extracted with ethyl acetate, washed with water, dried, and evaporated, to give about 0.88 g of 5-thiophen-3-yl-benzofuran-2-carboxylic acid 21, mp. 215-220° C.

Provenance & Evidence