Ribofuranose-ring cleavage of purine nucleosides with diisobutylaluminum hydride: Convenient method for the preparation of purine acyclonucleosides
作者:Kosaku Hirota、Yasunari Monguchi、Yukio Kitade、Hironao Sajiki
DOI:10.1016/s0040-4020(97)10098-9
日期:1997.12
The reaction of 2′,3′-O-isopropylidene protected purine nucleosides with diisobutylaluminum hydride (DIBAL-H) caused the reductive cleavage of the C-1′O-4′ bond to give the corresponding 9-d-ribitylpurines. The ring cleavage of inosine 1a, thioinosine 1f, and their derivatives having an alkyl group at the O6- or S6-position 1c,e, and g proceeded smoothly to afford the corresponding ribityl derivatives
2',3'- O-异亚丙基保护的嘌呤核苷与二异丁基氢化铝(DIBAL-H)的反应引起C-1'O-4'键的还原裂解,得到相应的9-d-核糖尿烷。肌苷1a,硫代肌苷1f及其在O 6或S 6位置1c,e和g具有烷基的衍生物的环裂解顺利进行,得到相应的核糖衍生物2a,f,c,e和g,而N 6-甲基化的腺苷衍生物1k和l显着抵抗了DIBAL-H的还原。5′-脱氧和5′-氯-5′-脱氧衍生物1b,d,i和j也在相似条件下在糖部分进行还原裂解。由鸟苷衍生物5以类似的方式制备了具有生物学意义的鸟苷6的无环类似物。合成嘌呤无环核苷的本方法学也被用于制备奈普兰霉素A的无环类似物17。