Catalysis-based enantioselective total synthesis of myxothiazole Z, (14S)-melithiazole G and (14S)-cystothiazole F
作者:Aude Colon、Thomas J. Hoffman、Julian Gebauer、Jyotirmayee Dash、James H. Rigby、Stellios Arseniyadis、Janine Cossy
DOI:10.1039/c2cc35721f
日期:——
A common strategy for the stereoselective and protecting group-free total synthesis of the myxobacterial antibiotics myxothiazole Z, (14S)-melithiazole G and (14S)-cystothiazole F is described featuring an asymmetric organocatalytic transfer hydrogenation, a palladium-catalyzed Stille coupling and a cross-metathesis as the key steps.
Coupling reaction of aryl and vinylhalides with terminal alkynes using a catalyst system of copper(I) iodide - triphenylphosphine proceeds efficiently in the presence of potassium carbonate to give the corresponding unsymmetrical acetylenes in good yield.