Substrate‐Rhodium Cooperativity in Photoinduced
ortho
‐Alkynylation of Arenes
摘要:
AbstractIn the realm of metallaphotocatalytic C−H activation strategy, the direct excitation of the transition metal which plays the dual role of light energy harnessing alongside performing the bond breaking and forming is a rare phenomenon. In this context we have developed the first photo‐induced Rh‐catalyzedortho‐alkynylation under ambient conditions without the requirement of silver salt, photocatalyst (PC) or any engineered substrate or catalyst. The transformation functions by the specific cooperative effect of a six‐membered rhodacycle which is the photo‐responsive species. The catalytic system allows the conjugation of arenes with sp3‐rich pharmacophoric fragments. The control experiments as well as the computational studies resolve the mechanistic intricacies for this transformation. An outer sphere electron transfer process from Rh to alkynyl radical is operative for the present photo‐induced transformation over the more common oxidative addition or 1,2‐migratory insertion pathways.
an air-stable dianthracenyl monophosphine ligand (diAnthPhos) which can be prepared in two steps from commercially available anthracene derivatives. The ligand exhibits excellent efficiency for palladium-catalyzed coupling reactions. In particular, Miyaura borylation of heterocycle-containing electrophiles can be facilitated employing the diAnthPhos ligand with a broad substrate scope and low catalyst
An air-stable aryl substituted indenyl phosphine used in combination with Pd(OAc)2 provides a highly efficient catalyst for the Suzuki–Miyaura cross-coupling reaction of sterically hindered aryl halides with aryl boronic acids.
Retraction: Suzuki-Miyaura Coupling of Aryl Tosylates and Mesylates in Water
作者:Jan Pschierer、Herbert Plenio
DOI:10.1002/ejoc.201000251
日期:2010.5
fluorenylphosphane (cataCXium Fsulf) enables thefacile Suzuki–Miyauracoupling of various (heterocyclic) aryl tosylates and aryl mesylate with various (heterocyclic) boronic acids in excellent yields (> 95 %) using water as the reaction solvent. Retraction: The following article from the European Journal of Organic Chemistry, “Suzuki–MiyauraCoupling of Aryl Tosylates and Mesylates in Water”, published online on
水溶性磺化芴基磷烷 (cataCXium Fsulf) 的钯配合物 (0.5 mol-%) 使各种(杂环)芳基甲苯磺酸酯和甲磺酸芳基酯与各种(杂环)硼酸以优异的产率(> 95 %)进行轻松的 Suzuki-Miyaura 偶联) 使用水作为反应溶剂。撤回:以下文章来自欧洲有机化学杂志,“Suzuki-Miyaura Coupling of Aryl Tosylates and Mesylates in Water”,于 2010 年 4 月 15 日在线发表于 Wiley 在线图书馆(www.onlinelibrary.wiley.com,doi:10.1002 /ejoc.201000251) 和印刷中 (Eur. J. Org. Chem.2010, 2934–2937),经通讯作者、期刊编辑、Haymo Ross 博士和 Wiley-VCH 同意撤回。由于手稿中列出的几个 1H 和 13C