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

A 1.0 N lithiumbis(trimethylsilyl)amide/THF solution (3.75 ml) was added dropwise to a solution of 613 mg of 7-acetyl-5-methylimidazo[5,1-b]thiazole in 34 ml of THF in an argon atmosphere at −73° C. The mixture was stirred at the same temperature for 50 min. A 1.59 N n-butyllithium/n-hexane solution (4.71 ml) was added dropwise thereto. The mixture was stirred at the same temperature for 50 min. Tri-n-butylstannyl chloride (1.16 ml) was added dropwise thereto. The mixture was further stirred at the same temperature for 40 min. An ammonium chloride solution was added to the reaction solution, followed by extraction with ethyl acetate and washing with brine. The extract was dried over anhydrous magnesium sulfate and then filtered. The solvent was removed by distillation under the reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:1) to give 1.40 g of the title compound.

1. stirringThe mixture was stirred at the same temperature for 50 min
2. stirringThe mixture was further stirred at the same temperature for 40 min
3. extractionfollowed by extraction with ethyl acetate
4. washwashing with brine
5. dry with materialThe extract was dried over anhydrous magnesium sulfate
6. filtrationfiltered
7. customThe solvent was removed by distillation under the reduced pressure
8. customThe residue was purified by column chromatography on silica gel (hexane:ethyl acetate=1:1)

ORD record

ord-8315b96c8aac480bbb227ad8813a94bf

Source dataset

uspto-grants-2004_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06677331B2