Tributyltin Chloride → 7Hydroxyiminomethyl-2-(tri-n-butylstannyl)imidazo[5,1-b]thiazole

Participants

Reaction Conditions

Reaction Steps

7-Hydroxyiminomethylimidazo[5,1-b]thiazole (a low-polarity geometrical isomer) (831 mg) was dissolved in 25 ml of THF and 5 ml of hexamethylphosphoramide (HMPA). A 1.55 N n-butyllithium/n-hexane solution (7.67 ml) was dropwise added in an argon atmosphere at −70° C. to the solution. The mixture was stirred at the same temperature for 40 min. Tri-n-butylstannyl chloride (1.84 ml) was added thereto. The mixture was stirred for 1.5 hr while raising the temperature to −40° C. An ammonium chloride solution was added to the reaction solution, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and filtered. The solvent was removed by distillation under the reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=3:1 to 1:1) to give 680 mg of 7hydroxyiminomethyl-2-(tri-n-butylstannyl)imidazo[5,1-b]thiazole (a geometrical isomer derived from a starting compound as a low-polarity oxime isomer).

Provenance & Evidence