Potassium Carbonate → 2-(4-Benzo[1,3]dioxol-5-yl-phenoxymethyl)-thiazole-4-carboxylic acid

Participants

Reaction Steps

A solution of 2-(4-iodo-phenoxymethyl)-thiazole-4-carboxylic acid ethyl ester (of intermediate 2; 75 mg, 0.2 mmol) in dioxane (4 mL) was added to a reaction tube containing 3,4-methylenedioxybenzeneboronic acid (ASDI Incorporated, Newark, Del.; 100 mg, 0.6 mmol). A solution of potassium carbonate (80 mg, 0.6 mmol) in water (0.4 mL) was added and the mixture was degassed. A solution of bis(tricyclohexylphosphine)-palladium (available from Strem Chemicals, Inc., Newburyport, Mass.; 7 mg, 0.01 mmol) in dioxane (0.5 mL) was added and the tube was heated in a microwave oven at 170 degrees for 25 min. The solution was acidified, filtered through silica gel, evaporated, and triturated with aqueous methanol to give 2-(4-benzo[1,3]dioxol-5-yl-phenoxymethyl)-thiazole-4-carboxylic acid. Mass spectrum MH+=356.

Provenance & Evidence