作者:Ian D. Jenkins、Fabienne Lacrampe、Justin Ripper、Lilian Alcaraz、Phuc Van Le、George Nikolakopoulos、Priscila de Almeida Leone、Rodney H. White、Ronald J. Quinn
DOI:10.1021/jo802456w
日期:2009.2.6
Inspired by the novel spiro structures of a number of bioactive natural products such as the histrionicotoxins, a series of novel spiro scaffolds have been designed and robust syntheses developed. The scaffolds are ready-to-use building blocks and can be easily prepared on a 5−20 g scale. They contain two amino groups (one Boc-protected) and have been designed for ease of conversion to a lead generation
受许多生物活性天然产物(如组织毒素)的新型螺旋结构的启发,已设计了一系列新型螺旋支架,并开发了稳健的合成方法。脚手架是现成的构建基块,可以轻松制备成5-20克的规模。它们含有两个氨基基团(一个受Boc保护的氨基基团),并且使用酰胺形成或还原性胺化步骤进行了设计,可轻松转换成铅生成库。以RCM为关键步骤,完成了1,9-二氮杂螺[5.5]十一烷和3,7-二氮杂螺[5.6]十二烷环的合成。据报道,有一种简单的后处理程序可以去除高度着色的钌残留物。1,8-二氮杂螺[4.的合成。5]癸烷支架是通过在酸性条件下使用溴介导的相应的4-氨基丁烯中间体的5-内基环化来实现的。这是要报道的这类环化反应的第一个例子。提出了一种新的机理,涉及从最初形成的溴离子到相邻氮原子的溴转移反应,这是这种反应在“正常”溴化条件下失败的原因。据报道,1-酰基-1,9-二氮杂螺[5.5]十一烷的异常重新排列为相应的9-酰基-1,9-二氮杂螺[5