reactivity and lead to distinct bond-forming modes. Herein we describe a rarely studied cycloaddition between nitrile oxides and electron-rich alkynes with reversed regioselectivity, leading to the useful 4-heterosubstituted isoxazoles. The use of a ruthenium catalyst completely overrides the inherent polarity of nitrile oxides. This reversed regioselectivity was also observed for their reactions with a range
官能团的极性反转(“颠倒”)可能会覆盖其固有的反应性,并导致形成不同的键形成模式。在本文中,我们描述了在
丁腈与富电子
炔烃之间逆向区域选择性极少研究的环加成反应,从而形成了有用的4-杂取代的
异恶唑。
钌催化剂的使用完全覆盖了
丁腈氧化物的固有极性。对于它们与一系列缺电子
炔烃的反应,也观察到了这种反向的区域选择性。