Cationic Rhodium(I)-Catalyzed Regioselective Tandem Heterocyclization/[3+2] Cycloaddition of 2-(1-Alkynyl)-2-alken-1-ones with Alkynes
作者:Hongyin Gao、Junliang Zhang
DOI:10.1002/chem.201103924
日期:2012.3.5
RhI in two minds: A RhI‐catalyzed tandem heterocyclization/[3+2] cycloaddition reaction was developed that provides rapid, efficient, and stereoselective access to highly substituted cyclopenta[c]furans from readily available 2‐(1‐alkynyl)‐2‐alken‐1‐ones and alkynes (see scheme). The cationic RhI acts as both a Lewis acid and a conventional transition‐metal catalyst, providing the first example of
铑我 在两个头脑:甲铑我催化的串联heterocyclization / [3 + 2]环加成反应的开发,提供了高度取代的环戊二烯并快速,高效,立体选择性接入[ C ^ ]从容易获得的2-呋喃(1-炔基) -2-烯烃-1炔烃(参见方案)。阳离子Rh I既可充当路易斯酸,又可充当常规的过渡金属催化剂,提供了充当Rhwis酸的Rh I物种的第一个实例。