Copper‐Catalyzed and Proton‐Directed Selective Hydroxymethylation of Alkynes with CO
<sub>2</sub>
作者:Mei‐Yan Wang、Xin Jin、Xiaofei Wang、Shumei Xia、Yue Wang、Shouying Huang、Ying Li、Liang‐Nian He、Xinbin Ma
DOI:10.1002/anie.202012768
日期:2021.2.19
strategy for copper‐catalyzedhydroxymethylation of alkynes with CO2 and hydrosilane was developed. Switched on/off a proton source, for example, tBuOH, directhydroxymethylation and reductive hydroxymethylation could be triggered selectively, delivering a series of allylic alcohols and homobenzylic alcohols, respectively, with high levels of Z/E, regio‐ and enantioselectivity. Such a selective synthesis
The synergistic copper/ppm Pd-catalyzed hydrocarboxylation of alkynes with formic acid as a CO surrogate as well as a hydrogen source: an alternative indirect utilization of CO<sub>2</sub>
作者:Shu-Mei Xia、Zhi-Wen Yang、Xiang-Yang Yao、Kai-Hong Chen、Li-Qi Qiu、Liang-Nian He
DOI:10.1039/d1gc02735b
日期:——
An unprecedented strategy has been developed involving the earth-abundant Cu-catalyzed hydrocarboxylation of alkynes with HCOOH to (E)-acrylic derivatives with high regio- and stereoselectivity via synergistic effects with ppm levels of a Pd catalyst. Both symmetrical and unsymmetrical alkynes bearing various functional groups were successfully hydrocarboxylated with HCOOH, and the modification of
已经开发了一种前所未有的策略,涉及通过与 Pd 催化剂的 ppm 水平的协同效应,用 HCOOH 将地球上丰富的 Cu 催化的炔烃加氢羧化为具有高区域和立体选择性的( E )-丙烯酸衍生物。带有各种官能团的对称和不对称炔烃均成功地被 HCOOH 烃基化,药物分子的修饰体现了该过程的实用性。该协议采用 HCOOH 作为 CO 替代物和氢供体,具有 100% 的原子经济性,可以将其视为间接 CO 2使用的替代方法。机理研究表明 Cu/ppm Pd 协同催化机制通过烯基铜物种作为潜在的中间体,由铜氢化物活性催化物种形成,HCOOH 作为氢源。这种包含廉价 Cu 和痕量 Pd 的双金属系统提供了一种可靠且有效的加氢羧化方法,以 HCOOH 作为氢源获得工业上有用的丙烯酸衍生物,并为优化其他与 Cu-H 相关的助催化系统提供了新的线索。
Palladium-catalyzed cascade reactions of coumarins with alkynes: synthesis of highly substituted cyclopentadiene fused chromones
作者:Lei Wang、Shiyong Peng、Jian Wang
DOI:10.1039/c1cc10939a
日期:——
The coupling of coumarins with alkynes is described, which proceeds through a palladium-catalyzed cascade sequence. This process provides a new route to the synthesis of highly substituted cyclopentadiene fused chromones.
Palladium-Catalyzed Oxidative Cycloaddition through CH/NH Activation: Access to Benzazepines
作者:Lei Wang、Jiayao Huang、Shiyong Peng、Hui Liu、Xuefeng Jiang、Jian Wang
DOI:10.1002/anie.201208076
日期:2013.2.4
Rings beget rings: Benzazepines, well‐known structural design elements in medicinal chemistry, are readily prepared by a one‐pot palladium‐catalyzed oxidativecycloaddition of isatins with various alkynes.
Efficient hydrocarboxylation of alkynes based on carbodiimide-regulated in situ CO generation from HCOOH: An alternative indirect utilization of CO2
作者:Shu-Mei Xia、Zhi-Wen Yang、Kai-Hong Chen、Ning Wang、Liang-Nian He
DOI:10.1016/s1872-2067(21)63848-2
日期:2022.7
operating toxic CO and circumventing sensitivity issue to the CO amount. On the basis of the attractive features of formic acid including easy preparation through CO2 hydrogenation and efficient liberation of CO, this protocol using formic acid as bridging reagent between CO2 and CO can be perceived as an indirect utilization of CO2, offering an alternative method for preparing acrylic acid analogues.