C4‘-Spiroalkylated Nucleosides Having Sulfur Incorporated at the Apex Position
作者:Leo A. Paquette、Fabrizio Fabris、Fabrice Gallou、Shuzhi Dong
DOI:10.1021/jo030196w
日期:2003.10.1
Methodology based on the concept of thionium ion-initiated pinacolic ring expansion has been developed for accessing C4'-spirocyclic thionucleosides. The readily available racemic ketones 6 and 37 are conveniently resolved via their acetals with (R)-mandelic acid. Subsequent reactions beginning with utilization of the Pummerer rearrangement lend themselves to functionalization of the spirocyclic core