2-(2-Haloalkenyl)-aryl Halides as Substrates for Palladium-Catalysed Tandem CN Bond Formation: Efficient Synthesis of 1-Substituted Indoles
作者:Michael C. Willis、Gareth N. Brace、Thomas J. K. Findlay、Ian P. Holmes
DOI:10.1002/adsc.200505484
日期:2006.5
2-(2-Haloalkenyl)-aryl halides, conveniently prepared in a single step from the corresponding o-halobenzaldehydes, are combined with amines under Pd catalysis to provide 1-substituted indoles. All combinations of Br and Cl leaving groups can be employed, and a range of substituents on the arene, alkene and amine, can all be tolerated. The use of 1,3-dichloro-substituted arenes allows a third amination
Novel reactions of phosphonium ylides with perhaloalkanes: First examples of halophilic attacks by phosphonium ylides and a facile route to α-haloalkylphosphonium salts
作者:Xing-Ya Li、Jin-Shan Hu
DOI:10.1016/s0040-4039(01)91362-0
日期:1987.1
Phosphoniumylides Ph3PCHR (R = H, CH3, C2H5, n-C3H7, n-C5H11) react readily with perhalofluoroalkanes to afford regiospecifically α-haloalkylphosphonium salts Ph3P+-CHXR Y− (X = I, Br, Cl) in good yields. These reactions reveal a new type of reactivity of phosphoniumylides, i.e., the halophilic attack on CX bonds, and may be useful for the regiospecific synthesis of substituted haloolefins via
鏻叶立德博士3 PCHR(R = H,CH 3,C 2 H ^ 5,NC 3 ħ 7,NC 5 H ^ 11)容易反应与perhalofluoroalkanes,得到区域专一性α-haloalkylphosphonium盐博士3 P + -CHXRÿ - (X = I,Br,Cl),收率高。这些反应揭示了yl的一种新型反应性,即对CX键的嗜盐攻击,对于通过维蒂希反应进行取代卤代烯烃的区域特异性合成可能有用。
Free radical-mediated vinyl amination: a mild, general pyrrolidinyl enamine synthesis
作者:Benjamin M. Nugent、Amie L. Williams、E.N. Prabhakaran、Jeffrey N. Johnston
DOI:10.1016/j.tet.2003.04.003
日期:2003.11
The complete scope of freeradical-mediated vinyl amination is described, using 5-exo-trig cyclizations of vinyl radicals to the nitrogen of azomethines. The focus is primarily on N,N-dialkyl enamines since their nucleophilicity renders them the most challenging enamines to synthesize using redox conditions. These studies establish several encouraging precedents for the broader application of this