Tricyclic nucleosides derived from D-glucose. Synthesis and conformational behaviour
作者:Poul Nielsen、Michael Petersen、Jens Peter Jacobsen
DOI:10.1039/b006082h
日期:——
steps from diacetone-D-glucose, taking advantage of a stereoselective Grignard reaction, a stereoselective dihydroxylation and a regioselective tandem ring-closing procedure. The configuration of 3 is confirmed by measuring the 3JHH coupling constants in connection with molecular modelling and ab initio calculations, as these exclude alternative tricyclic nucleoside structures. The conformational preference
两个异头物 核苷从11个步骤合成具有三环碳水化合物部分3和14的化合物双丙酮-D-葡萄糖,利用立体选择性格氏反应,立体选择性二羟基化和区域选择性串联闭环程序。3的构型通过与分子建模和从头算相联系的3 J HH耦合常数的测量来确认,因为这些不包括替代的三环核苷结构。描述了3的构象偏好。发现呋喃糖环处于O-4'-内构象,并且γ扭转角在+ ap范围内。