Gold‐Catalyzed One‐Step Construction of 2,3‐Dihydro‐1
<i>H</i>
‐Pyrrolizines with an Electron‐Withdrawing group in the 5‐position: A Formal Synthesis of 7‐Methoxymitosene
作者:Ze‐Yi Yan、Yuanjing Xiao、Liming Zhang
DOI:10.1002/anie.201203678
日期:2012.8.20
What a ring formation! Bicyclic dihydropyrrolizines with an electron‐withdrawing group (EWG) at the 5‐position are formed in one step from linear azidoenynes under gold catalysis. This novel route involves the use of azide as a nitrene precursor, electronically‐controlled regioselectivity, and the generation of destabilized 1‐azapentadienium ions and their pericyclic reactions. This method was used
什么是环的形成!在金催化下,一步线性叠氮en炔在一个步骤中形成了一个在5位带有一个吸电子基团(EWG)的双环二氢吡咯烷酮。这种新颖的途径涉及使用叠氮化物,为氮烯的前体,电子控制区域选择性,和不稳定1- azapentadienium离子的产生和它们的周环反应。该方法用于7-甲氧基亚油基的正式合成(参见方案)。