Asymmetric Synthesis of 4′-Quaternary 2′-Deoxy-3′- and -4′-<i>epi</i>-β-<i>C</i>- and -<i>N</i>-Nucleosides
作者:Dieter Enders、Antje Hieronymi、Gerhard Raabe
DOI:10.1055/s-2008-1072577
日期:2008.5
A versatile and efficient route to both enantiomers of 4′-quaternary 2′-deoxy-3′- and -4′-epi-β-C- and -N-nucleosides is described. The asymmetric synthesis involves the SAMP/RAMP-hydrazone α-alkylation methodology and diastereoselective nucleophilic 1,2-additions. Manipulation of the substituents in the anomeric position leads to the thermodynamically more stable β-anomers of excellent diastereo- and enantiomeric purity (>99% de and ee).
介绍了一种获得 4′-季 2′-脱氧-3′-和-4′-表δ-C-和-N-核苷两种对映体的多功能高效途径。不对称合成涉及 SAMP/RAMP- 酰腙δ-烷基化方法和非对映选择性亲核 1,2-加成。通过操纵同分异构体位置上的取代基,可以得到热力学上更稳定的δ-²-异构体,其非对映和对映纯度极高(de 和 ee 均大于 99%)。