Enantioselective construction of 2,5-dihydropyrrole skeleton with quaternary stereogenic center via catalytic asymmetric 1,3-dipolar cycloaddition involving α-arylglycine esters
作者:Feng Shi、Gui-Juan Xing、Wei Tan、Ren-Yi Zhu、Shujiang Tu
DOI:10.1039/c2ob26566d
日期:——
A catalytic asymmetric construction of synthetically and biologically important 2,5-dihydropyrrole scaffolds with concomitant creation of multiple chiral carbon centers including one quaternary stereogenic center in high yields (up to 99%) and excellent enantioselectivities (up to 99% ee) has been established via an organocatalytic 1,3-dipolar cycloaddition using α-arylglycine esters as azomethine precursors
已经建立了具有重要合成和生物学意义的2,5-二氢吡咯支架的催化不对称结构,并伴随创建了多个手性碳中心,包括一个高产率(高达99%)和良好对映选择性(高达99%ee)的四级立体异构中心。通过使用α-芳基甘氨酸酯作为偶氮甲碱前体的有机催化1,3-偶极环加成反应。此外,已经对α-芳基甘氨酸酯产生的偶氮甲胺烷基化物与炔烃的催化不对称的1,3-偶极环加成进行了详细研究,提供了以良好的对映选择性同时进入两个2,5-二氢吡咯非对映异构体的有效途径。