Highly Substituted Furo[3,4-<i>d</i>][1,2]oxazines: Gold-Catalyzed Regiospecific and Diastereoselective 1,3-Dipolar Cycloaddition of 2-(1-Alkynyl)-2-alken-1-ones with Nitrones
作者:Feng Liu、Yihua Yu、Junliang Zhang
DOI:10.1002/anie.200901299
日期:2009.7.13
Rapid access: A gold(I)‐catalyzed 1,3‐dipolar cycloaddition of 2‐(1‐alkynyl)‐2‐alken‐1‐ones with nitrones provides a practical, regiospecific, and stereoselective access to highly substituted fused bicyclic furo[3,4‐d][1,2]oxazines under mild conditions (see scheme). These fused heterobicyclic compounds can be readily converted into furans or 3,6‐dihydro‐2H‐1,2‐oxazines in a chemoselective fashion
快速获得:金(I)催化的2-(1-炔基)-2-烯丙基-1-酮与1,3-偶极环的加成反应,提供对高取代的稠合双环呋喃的实用,区域特异性和立体选择性的访问[ 3,4- [ d ] [1,2]恶嗪在温和的条件下(请参阅方案)。这些稠合的杂环双环化合物可以以化学选择性方式轻易地转化为呋喃或3,6-二氢-2 H -1,2-恶嗪。