Stable nitroxyl radicals with triple bonds: 4-acetylenyl-3-imidazoline-3-oxide-1-oxyls
摘要:
Cross-coupling reaction of 1-hydroxy-2,2,5,5-tetramethyl-4-[2-(p-iodophenyl)vinyl]1-3-imidazoline-3-oxide with copper(l) salts of 1-aryl(hetaryl)alkynes leads to the corresponding 2,2,5,5-tetramethyl-4-[2-(p-aryl(hetaryl)ethynylphenyl)vinyl]-3-imidazoline-3-oxide-1-oxyls in high yields. (c) 2006 Elsevier Ltd. All rights reserved.
Stable nitroxyl radicals with triple bonds: 4-acetylenyl-3-imidazoline-3-oxide-1-oxyls
作者:Sergei F. Vasilevsky、Svetlana V. Klyatskaya、Olga L. Korovnikova、Svetlana A. Amitina、Dmitri V. Stass、Igor A. Grigor'ev、José Elguero
DOI:10.1016/j.tet.2006.02.036
日期:2006.5
Cross-coupling reaction of 1-hydroxy-2,2,5,5-tetramethyl-4-[2-(p-iodophenyl)vinyl]1-3-imidazoline-3-oxide with copper(l) salts of 1-aryl(hetaryl)alkynes leads to the corresponding 2,2,5,5-tetramethyl-4-[2-(p-aryl(hetaryl)ethynylphenyl)vinyl]-3-imidazoline-3-oxide-1-oxyls in high yields. (c) 2006 Elsevier Ltd. All rights reserved.
Synthetic and mechanistic aspects of cross-coupling of nitroxyl radicals of 3-imidazoline series with terminal alkynes
作者:Sergei F. Vasilevsky、Olga L. Krivenko、Vitalii R. Gorelik、Igor V. Alabugin
DOI:10.1016/j.tet.2008.06.088
日期:2008.9
Practical syntheticapproaches to the new class of acetylenic derivatives of 3-imidazolyl-3-oxide-1-oxyls, including biradicals, were developed through cross-coupling reactions of 3-imidazolyl halides with either terminal alkynes or their copper salts. The presence of nitroxyl functional group as an internal oxidant leads to a competition between the formation of cross-coupling products and the products