Synthesis and In Vitro Activity Evaluation of 2′,3′-<i>C</i>-Dimethyl Carbocyclic Nucleoside Analogues as Potential Anti-HCV Agents
作者:Ok Hyun Ko、Joon Hee Hong
DOI:10.1080/15257770903155642
日期:2009.9.11
The first synthetic route of novel 2′(β),3′(β)-C-dimethyl carbodine analogues is described. The key intermediate cyclopentenyl alcohol 11(β) prepared from Weinreb amide 4 via ring-closing metathesis (RCM) and vicinal dihydroxylation. Coupling of 12 with nucleosidic bases via the Pd(0) catalyzed reaction followed by stereoselective dihydoxylation and deprotection afforded the target carbocyclic nucleoside
Palladium Hydroxide Catalyzed Isomerization of Primary Allylic Alcohols to Aldehydes: Application to the Formal Synthesis of (−)-Brevisamide
作者:Gowravaram Sabitha、Sambit Nayak、M. Bhikshapathi、J. S. Yadav
DOI:10.1021/ol102658d
日期:2011.2.4
The Pd-catalyzed isomerization of primary allylic alcohols into the corresponding saturated aldehydes has been achieved at room temperature for the first time in good to excellent yields under mild conditions. The functional group compatibility in this reaction is studied, and this new methodology has been successfully applied in the synthesis of a C5-C13 tetrahydropyran ring system of (-)-brevisamide in seven steps.