Conformational Restriction of Nucleosides by Spirocyclic Annulation at C4‘ Including Synthesis of the Complementary Dideoxy and Didehydrodideoxy Analogues
作者:Leo A. Paquette、Christopher K. Seekamp、Alexandra L. Kahane
DOI:10.1021/jo0301954
日期:2003.10.1
The concept of spirocyclic restriction, when generically applied to nucleoside mimics, allows for the preparation of diastereomeric pairs carrying either a syn- or anti-oriented hydroxyl at C-5'. Reported herein are convenient synthetic routes to enantiomerically pure 1-oxaspiro[4.4]nonanes featuring fully dihydroxylated end products as well as congeners having dideoxy and didehydrodideoxy substitution
螺环限制的概念一般应用于核苷模拟物时,可以制备在C-5'处带有顺方向或反方向羟基的非对映体对。本文报道的是合成对映体纯的1-氧杂螺[4.4]壬烷的简便合成路线,所述对映体具有完全二羟基化的终产物以及具有双脱氧和双脱二氧取代模式的同类物。值得注意的是利用了通过苯磺酰化作用在呋喃糖区引入不饱和度的能力,以及在氯化锡的催化下通过其甲硅烷基化衍生物引入尿嘧啶和胸腺嘧啶的能力。