作者:María-Cruz Bonache、Alessandra Cordeiro、Paula Carrero、Ernesto Quesada、María-José Camarasa、María-Luisa Jimeno、Ana San-Félix
DOI:10.1021/jo9019144
日期:2009.12.4
An α hydroxy pyrrolidine tricyclic nucleoside 3 and its spontaneous reaction with acetone is described. In this transformation highly functionalized polycyclic nucleosides with rather unusual molecular skeletons are formed in a complete regio- and stereoselective way. The reaction involves the formation of three new bonds, two of them novel carbon−carbon bonds, in a one-pot way. An enamine−iminium
描述了α羟基吡咯烷三环核苷3及其与丙酮的自发反应。在这种转化中,以完全的区域选择性和立体选择性的方式形成具有相当不寻常的分子骨架的高度官能化的多环核苷。该反应涉及一锅法形成三个新的键,其中两个是新的碳-碳键。提出了一种带有甲醇胺,亚胺离子和烯胺中间体参与的烯胺-亚胺机理,作为这种转化的合理解释。简要研究了反应范围,得出的结论是酮(R 1 COR 2)的性质对于NH初始攻击羰基至关重要。