Synthesis of the Cyclopentyl Nucleoside (−)-Neplanocin A fromD-Glucosevia Zirconocene-Mediated Ring Contraction
作者:Leo A. Paquette、Zhenjiao Tian、Christopher K. Seekamp、Tony Wang
DOI:10.1002/hlca.200590099
日期:2005.6
Two approaches for the conversion of d-glucose to (−)-neplanocin A (2), both based on the zirconocene-promoted ring contraction of a vinyl-substituted pyranoside, are herein evaluated (Scheme 1). In the first pathway (Scheme 2), the substrate possesses the α-d-allo configuration (see 6) such that ultimate introduction of the nucleobase would require only an inversion of configuration. However, this