一个级联C(sp3) -H无效化,涉及C(alkyl),C(alkyl) -Pallada循环中间体
Liwei Zhou1,2, Xiahong Chen1, Qiong Peng3
1Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, and Key Laboratory of the Assembly and Application of Organic Functional Molecules of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, Hunan, 410081, China.
这项研究引入了一种新型的级反应,用于使用C(alkyl),C(alkyl) -palladacycles的C(sp3) -H无效化. 这种方法有效地从易于获得的前体中合成复杂的 pyridinediones.
科学领域:
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
- 有机合成 有机合成
背景情况:
- C-H 键功能化是合成化学的一个关键领域.
- 大多数研究集中在C(aryl),C-palladacycles上,使得C(alkyl),C(alkyl) -palladacycles的探索较少.
- 涉及C ((alkyl),C ((alkyl) -palladacycles的新型催化方法很少.
研究的目的:
- 开发一种新型的级联C(sp3)-H无效反应.
- 为了利用C ((alkyl),C ((alkyl) -palladacycles作为催化中的关键中间体.
- 为了合成复杂的化pyridinedione结构.
主要方法:
- 内部分子的赫克反应,其次是C ((sp3) -H激活,形成C ((alkyl),C ((alkyl) -palladacycles.
- 通过α-烯酸捕获Palladicycle中间体.
- 适用于基结合和基结合的环基化物.
- 机械学研究包括密度函数理论 (DFT) 计算.
主要成果:
- 建立了一个前所未有的级联C ((sp3) -H取消协议.
- 三环化化二二是由基连接的前体合成的.
- 五环复合型二二从通过 dearomatization/C(sp3)-H激活/decarboxylative 循环复合的印结合的前体构造出来.
- 通过省略α-烯酸酸,形成了一个具有四个成员环的独特的三环骨架.
结论:
- 这项工作扩大了C ((alkyl),C ((alkyl) -palladacycle化学的范围.
- 开发的战略为复杂的化异环化合物提供了一条有效的途径.
- 五个组成的C ((alkyl),C ((alkyl) -palladacycles被确定为关键的中间体.
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