Synthesis of enantiopure vicinal diaminoesters and ketopiperazines from N-sulfinylimidazolidines
作者:Alma Viso、Roberto Fernández de la Pradilla、Aída Flores、Ana García
DOI:10.1016/j.tet.2007.05.062
日期:2007.8
A short and efficient synthesis of mono- and bicyclic ketopiperazines bearing methoxycarbonyl substituents is described. The route entails selective protection and solvolysis of N-sulfinylimidazolidines to provide vicinal diaminoesters with the nitrogen atoms suitably differentiated. Then, an N-acylation/cyclization protocol renders the ketopiperazines. In addition a diastereoselective route to an
描述了带有甲氧基羰基取代基的单环和双环酮哌嗪的短而有效的合成。该途径需要对N-亚磺酰亚胺基咪唑烷进行选择性保护和溶剂分解,以提供具有适当区分的氮原子的邻二氨基酯。然后,N-酰化/环化方案产生了酮哌嗪。另外,描述了通过该方法可获得的通过2-哌啶基甘氨酸酯到天然二酮哌嗪DKP 593A类似物的非对映选择性途径。