An efficient diastereo- and enantioselective synthesis of 4′-quaternary 2′-deoxy-3′-epi-β-C-nucleosides is described employing the RAMP-hydrazone methodology to establish the first stereocentre. Further key steps include diastereoselective nucleophilic 1,2-additions with Grignard and organocerium reagents.
介绍了一种高效的非对映和对映体选择性合成 4′-季 2′-脱氧-3′-epi-δ-C-核苷的方法,该方法采用
RAMP 酰腙法建立第一个立体中心。进一步的关键步骤包括使用
格氏试剂和有机
铈试剂进行非对映选择性亲核 1,2-加成。