Pyridinyl Directed Alkenylation with Olefins via Rh(III)-Catalyzed C–C Bond Cleavage of Secondary Arylmethanols
作者:Hu Li、Yang Li、Xi-Sha Zhang、Kang Chen、Xin Wang、Zhang-Jie Shi
DOI:10.1021/ja205228y
日期:2011.10.5
Novel C-C bondcleavage of secondary alcohols through Rh(III)-catalyzed β-carbon elimination directed by a pyridinyl group is reported. A five-membered rhodacycle is proposed as a key intermediate, which undergoes further alkenylation with various olefins. This novel transformation shows high efficiency along with excellent selectivity in mild conditions. A wide range of functionalities are compatible
报道了仲醇通过由吡啶基团引导的 Rh(III) 催化的 β-碳消除来裂解仲醇的新型 CC 键。五元罗达环被提议作为关键中间体,它与各种烯烃进行进一步的烯基化。这种新型转化在温和条件下显示出高效率和出色的选择性。兼容多种功能。本研究提供了一种新的策略来进行 CC 键活化。
Rhodium-Catalyzed Decarbonylative Direct Olefination of Arenes with Vinyl Carboxylic Acids
作者:Ruiying Qiu、Lingjuan Zhang、Conghui Xu、Yixiao Pan、Hongze Pang、Lijin Xu、Huanrong Li
DOI:10.1002/adsc.201401020
日期:2015.4.13
A rhodium(I)‐catalyzed direct CH bond olefination of pyridyl‐substituted arenes with readily available vinyl carboxylic acids has been realized. This reaction occurred efficiently without the need for any external oxidant, affording the ortho‐olefinated products in high yields and excellent regioselectivities. Diversely substituted vinyl carboxylic acids behaved as efficient olefination reagents under
A novel method for direct transformation of allyl groups in allylbenzene derivatives to alkenyl groups via rhodium-catalyzed C-C bond cleavage is reported. The alkenylation with styrenes of allylbenzenes containing pyridyl and pyrazolyl groups as a directing group proceeded efficiently to give alkenylation products. We also developed a new protocol for transformation of an ortho-prenylated phenol to
报道了一种通过铑催化的 CC 键裂解将烯丙基苯衍生物中的烯丙基直接转化为烯基的新方法。含有吡啶基和吡唑基作为导向基团的烯丙基苯与苯乙烯的烯基化反应有效地进行,得到烯基化产物。我们还开发了一种将邻异戊二烯化苯酚转化为苯胺衍生物的新方案。