Coupling-Isomerization-Stetter and Coupling-Isomerization-Stetter-Paal-Knorr Sequences - A Multicomponent Approach to Furans and Pyrroles
作者:Thomas J. Müller、Roland U. Braun
DOI:10.1055/s-2004-831192
日期:——
2,3,5-Trisubstituted furans 6 and 1,2,3,5-tetrasubstituted pyrroles 8 can be synthesized in good yields in a one-pot three-step three- or four-component process by a coupling-isomerization-Stetter-Paal-Knorr sequence of an electron-poor (hetero)aryl halide 1, a terminal propargyl alcohol 2, an aldehyde 3, and, in the case of pyrroles, a primary amine 7. All novel furans and pyrroles exhibit a strong blue fluorescence with considerable Stokes shifts.
2,3,5-三取代呋喃 6 和 1,2,3,5-四取代吡咯 8 可以通过一个一步三步的三组分或四组分反应过程,以良好的产率合成。该过程由电子贫乏的(杂)芳基卤化物 1、末端丙炔醇 2、醛 3,以及在吡咯的情况下,伯胺 7 通过耦合-异构化-Stetter-Paal-Knorr 序列进行。所有新颖的呋喃和吡咯都表现出强烈的蓝色荧光,并具有相当大的斯托克斯位移。