Generation of Iminyl Copper Species from α-Azido Carbonyl Compounds and Their Catalytic C−C Bond Cleavage under an Oxygen Atmosphere
摘要:
A copper-catalyzed reaction of a-azidocarbonyl compounds under an oxygen atmosphere is reported where nitriles are formed via C C bond cleavage of a transient Iminyl copper intermediate. The transformation is carried out by a sequence of denitrogenative formation of iminyl copper species from alpha-azidocarbonyl compounds and their C C bond cleavage, where molecular oxygen (1 atm) is a prerequisite to achieve the catalytic process and one of the oxygen atoms of O-2 was found to be incorporated Into the beta-carbon fragment as a carboxylic acid.
首次开发了在B(C 6 F 5)3(5 mol%)存在下具有挑战性的无金属的α-芳基α-重氮酸酯叠氮化物插入物。该反应具有易于操作,底物范围宽和条件温和的特点,并以中等至高收率提供了相应的产物。更重要的是,由于未观察到环丙烷化或环丙烷化,因此对烯烃和炔烃官能团的耐受性良好。此外,在简单转化后,相应的叠氮化物产物可以转化为伯胺或1,2,3-三唑衍生物。