Synthesis and differential functionalisation of pyrrolidine and piperidine based spirodiamine scaffolds
作者:Kamil Weinberg、Axel Stoit、Chris G. Kruse、Mairi F. Haddow、Timothy Gallagher
DOI:10.1016/j.tet.2013.03.064
日期:2013.6
The synthesis and differential substitution/protection of a series of spirodiamine scaffolds are described. Methods for selective access to the two mono-N-methyl isomers based on 2,7-diazaspiro[4.5]decane are also described. Key precursors associated with this chemistry are prone to rearrangement and methods for circumventing this issue are reported. While direct mono-carbamoylation (Boc) was not efficient
描述了一系列螺二胺支架的合成和差异取代/保护。还描述了基于2,7-二氮杂螺[4.5]癸烷选择性获得两种单-N-甲基异构体的方法。与该化学反应有关的关键前体易于重排,并报道了解决该问题的方法。而直接单声道-氨基甲酰化作用(Boc)无效,选择性地脱保护对称对称的二胺衍生的双重Boc保护的衍生物可提供mono-Boc变体。还进行了N-芳基化,以引入2-氯-5-吡啶基部分的一系列单取代的螺二胺为例,该2-氯-5-吡啶基部分是优先的烟碱激动剂亚结构,以提供单芳基化的仲和叔螺二胺变体。