Three-Component Synthesis of Ynediones by a Glyoxylation/Stephens-Castro Coupling Sequence
作者:Eugen Merkul、Janis Dohe、Charlotte Gers、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/anie.201007194
日期:2011.3.21
two steps forward! Starting from diverse heterocycles, the title reaction furnishes ynediones under very mild conditions in a direct and preparatively simple one‐pot process. The key to avoiding decarbonylation is the CuI‐catalyzed Stephens–Castro alkynylation rather than the usually more efficient Sonogashira coupling. In addition, novel highly atom‐economical four‐component syntheses of various heterocycles
退后一步,前进两步!从各种杂环开始,标题反应可在非常温和的条件下,通过直接且制备简单的一锅法提供乙炔。避免脱羰基的关键是Cu I催化的Stephens-Castro炔基化反应,而不是通常更有效的Sonogashira偶联反应。此外,可以实现各种杂环的新颖的原子经济的四组分合成。