Generation and Reactivity of 2-Amido-1,3-diaminoallyl Cations: Cyclic Guanidine Annulations via Net (3 + 2) and (4 + 3) Cycloadditions
作者:V. Raghavendra Rao Kovvuri、Haoran Xue、Daniel Romo
DOI:10.1021/acs.orglett.0c00019
日期:2020.2.21
direct conversion of alkenes to cyclic guanidines, we report that 1,3-dipolar cycloadditions of 2-amido-1,3-diamino allylic cations with alkenes provide a new method for direct cyclic guanidine annulation. Generated under oxidative conditions, the 2-amido-1,3-diaminoallyl cations react as 1,3-dipoles providing rapid access to 2-amino imidazolines through net (3 + 2) cycloadditions. The utility is demonstrated
对于一种将烯烃直接转化为环状胍的方法,我们报道了2-氨基-1,3-二氨基烯丙基阳离子与烯烃的1,3-偶极环加成反应为直接环状胍环化提供了一种新方法。在氧化条件下生成的2-酰胺基-1,3-二氨基烯丙基阳离子以1,3-偶极子的形式发生反应,可通过净(3 + 2)环加成反应快速获得2-氨基咪唑啉。通过简单地合成麦冬蛋白生物碱phakellin证明了其实用性。所述的1,3-偶极也与二烯一起参与净(4 + 3)环加成反应。