A practical synthesis of a novel class of fused heterocycles was developed from 1-(2-iodobenzyl)-1H-pyrrole and -indoles with various bromoalkyl aryl alkynes. This palladium(0)-catalyzed norbornene-mediated domino reaction allows the efficient formation of three carbon-carbon bonds in a one-pot procedure with PdCl2 and tri-2-furylphosphine (TFP), in the presence of norbornene and Cs2CO3 in acetonitrile at 90 ËC. New seven-membered-ring fused heterocycles are obtained in moderate to excellent yields.
                                    一种新型融合杂环的实用合成方法是由 1-(2-
碘苄基)-1H-
吡咯和
吲哚与各种
溴烷基芳基炔化合物合成的。这种
钯(0)催化的
降冰片烯介导的多米诺反应可以在
降冰片烯和 Cs2CO3 的存在下,于 90 ℃ 的
乙腈中,通过 PdCl2 和三-2-
呋喃基膦(
TFP)的一锅式反应,高效地形成三个碳-碳键。新的七元环融合杂环以中等到极好的收率获得。