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.
Enantioselective Organocatalytic Conjugate Reduction of β-Azole-Containing α,β-Unsaturated Aldehydes
作者:Thomas J. Hoffman、Jyotirmayee Dash、James H. Rigby、Stellios Arseniyadis、Janine Cossy
DOI:10.1021/ol900893e
日期:2009.7.2
β-Azole-containing α,β-unsaturated aldehydes were successfully reduced under highly enantioselective organocatalytictransferhydrogenation conditions. The products were obtained in good yields and up to 94% optical purity. This simple process was successfully applied to the synthesis of the C7−C14 fragment of ulapualide A, a natural product which exhibits promising antitumor activity.