N-Vinylpyridinium tetrafluoroborate salts as reagents for the stereoselective and regioselective synthesis of symmetrical (2E,4E)-1,6-dioxo-2,4-dienes
作者:Ge Gao、Neil Brown、Machiko Minatoya、Keith R. Buszek
DOI:10.1016/j.tetlet.2008.08.076
日期:2008.11
in Pd(0)-catalyzed Suzuki cross-coupling reactions with aryl and vinyl boronic acids. We now report that these crystalline, air-stable, and non-hygroscopic salts are also useful reagents for the synthesis of symmetrical (2E,4E)-1,6-dioxo-2,4-dienes (diene diones), which in turn are valuable starting materials for the synthesis of various five-membered heterocycles. The optimization of reaction conditions
我们之前已经证明了 N-乙烯基吡啶鎓四氟硼酸盐在 Pd(0) 催化的 Suzuki 与芳基和乙烯基硼酸的交叉偶联反应中作为新型亲电偶联伙伴的效用。我们现在报告说,这些结晶的、空气稳定的和非吸湿性的盐也是合成对称 (2E,4E)-1,6-二氧-2,4-二烯(二烯二酮)的有用试剂,反过来是合成各种五元杂环的重要原料。讨论了反应条件的优化以及还原二聚化的范围和局限性。