Synthesis of 2′,3′-cis-fused pyrrolidino-β-D-nucleosides and their conformational analysis by 500 MHz 1H-NMR
作者:Zhen Xi、Corine Glemarec、Jyoti Chattopadhyaya
DOI:10.1016/s0040-4020(01)87228-8
日期:1993.8
conformations. The pyrrolidine adopts a North-type conformation in 19a – 22a when the ribose is in a South-type conformation. In contrast, the pyrrolidinering adopts a South-type conformation when the ribose is in a North-type conformation (in 35a – 37a). Compounds 19a – 23a and 35a – 38a show a preference for the γ+ conformation (∼70%). The glycosyl conformation for all pyrrolidine-fused systems was found