Synthesis of α-ketols by functionalization of captodative alkenes and divergent preparation of heterocycles and natural products
摘要:
Captodative alkene 1-acetylvinyl p-nitrobenzenecarboxylate 1a was evaluated for its reactivity in Lewis acid-catalyzed Michael additions with functionalized benzene rings and heterocycles, leading to diverse conjugated addition adducts. The hydrolysis of the latter resulted in the desired functionalized a-ketols, including natural alkaloid actinopolymorphol B (24a). The alpha-ketol core structure of these compounds was used as the building block for the synthesis of the natural alkaloid tanakine (25) and for the divergent construction of highly substituted heterocycles, such as 4-oxazolin-2-ones and butenolides, and their respective fused polycyclic derivatives. (C) 2015 Elsevier Ltd. All rights reserved.
The present disclosure is generally directed to antiviral compounds, and more specifically directed to compounds which can inhibit the function of the NS5A protein encoded by Hepatitis C virus (HCV), compositions comprising such compounds, and methods for inhibiting the function of the NS5A protein.