Treatment of 2′,3′-O-isopropylidenepyrimidine nucleosides (1; uridine and cytidine) with excess N-halogenosuccinimides in an aprotic solvent at ambient temperature results in the exclusive formation of the corresponding 5′-O,6-cyclo-5, 5-dihalogeno-5,6-dihydro-2′,3′-O-isopropylidenepyrimidine nucleosides 2.
在常温下,于非质子性溶剂中,使用过量的N-卤代琥珀
酰亚胺处理2',3'-O-异丙叉
吡啶核苷(1,即
尿苷和
胞苷),会导致独有地生成相应的5'-O,6-环-5,5-二卤-5,6-二氢-2',3'-O-异丙叉
吡啶核苷2。