Consecutive One-Pot Sonogashira-Glaser Coupling Sequence - Direct Preparation of Symmetrical Diynes by Sequential Pd/Cu Catalysis
作者:Eugen Merkul、Dominik Urselmann、Thomas J. J. Müller
DOI:10.1002/ejoc.201001472
日期:2011.1
Sonogashira coupling and the catalytic Glaser coupling are both catalyzed by the Pd-Cu complex couple and can be concatenated to a consecutive sequentially Pd/Cu-catalyzed process in a one-pot fashion, and air oxygen serves as the only oxidant in the second step. In a pseudo-four-component synthesis, a broad variety of symmetrically substituted 1,4-bis(hetero)aryl-1,3-butadiynes are obtained in good
Sonogashira 偶联和催化 Glaser 偶联均由 Pd-Cu 络合物对催化,并且可以一锅法连接到连续的 Pd/Cu 催化过程中,空气中的氧气作为第二步中的唯一氧化剂. 在伪四组分合成中,以良好到极好的收率获得了多种对称取代的 1,4-双(杂)芳基-1,3-丁二炔。有趣的是,已发现碘离子的存在比其他卤化物更有利于触发 Pd/Cu 催化的 Glaser 步骤,并且 Pd 和 Cu 物质以及作为碱的三乙胺是两种偶联的先决条件,其继续进行如果以一锅顺序执行,则效率更高。