Ru-Catalyzed [3 + 2] Cycloaddition of Nitrile Oxides and Electron-Rich Alkynes with Reversed Regioselectivity
作者:Qiang Feng、Hai Huang、Jianwei Sun
DOI:10.1021/acs.orglett.1c00273
日期:2021.4.2
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。