Ru-Catalyzed Redox-Neutral Cleavage of the N–O Bond in Isoxazolidines: Isatogens to Pseudoindoxyls via a One-Pot [3 + 2]-Cycloaddition/N–O Cleavage
摘要:
A novel metal-catalyzed oxygen atom transfer reaction onto olefins is reported. By taking isatogens as substrates, a one-pot [3 + 2]-cycloaddition of nitrone with olefins followed by the Ru-catalyzed redox-neutral N-O bond cleavage of intermediate isoxazolidine has been executed as a simple method for the synthesis of 2,2-disubstituted pseudoindoxyls.
Exploration of Forbidden Povarov Processes as a Source of Unexpected Reactivity: A Multicomponent Mannich-Ritter Transformation
作者:Sara Preciado、Esther Vicente-García、Salomé Llabrés、F. Javier Luque、Rodolfo Lavilla
DOI:10.1002/anie.201202927
日期:2012.7.9
geometrically or electronically restricted imines for Povarov‐type processes does not afford the anti‐Bredt tetrahydroquinolines, but leads instead to highly functionalized structures through novel reaction pathways (see picture; LA=Lewis acid). The exploration of “forbidden” routes constitutes a valuable approach in the search for new multicomponent reactions.
当一扇门关闭时,一个窗户就会打开!在Povarov型工艺中使用受几何或电子限制的亚胺并不能提供抗Bredt四氢喹啉,而是通过新颖的反应途径获得高度官能化的结构(参见图片; LA =路易斯酸)。探索“禁止”路线是寻找新的多组分反应的一种有价值的方法。