Ligand survey results in identification of PNP pincer complexes of iridium as long-lived and chemoselective catalysts for dehydrogenative borylation of terminal alkynes
作者:Chun-I Lee、Jessica C. DeMott、Christopher J. Pell、Alyson Christopher、Jia Zhou、Nattamai Bhuvanesh、Oleg V. Ozerov
DOI:10.1039/c5sc02161h
日期:——
Following the report on the successful use of SiNN pincercomplexes of iridium as catalysts for dehydrogenative borylation of terminal alkynes (DHBTA) to alkynylboronates, this work examined a wide variety of related pincerligands in the supporting role in DHBTA. The ligand selection included both new and previously reported ligands and was developed to explore systematic changes to the SiNN framework
继关于成功使用铱的 SiNN 钳形配合物作为末端炔烃 (DHBTA) 脱氢硼化为炔基硼酸盐的催化剂的报告之后,这项工作研究了各种相关钳形配体在 DHBTA 中的支持作用。配体选择包括新的和以前报道的配体,旨在探索 SiNN 框架(8-(2-二异丙基甲硅烷基苯基)氨基喹啉)的系统变化。令人惊讶的是,只有二芳基氨基/双(膦) PNP 系统显示出任何 DHBTA 反应性。筛选中使用的特定 PNP 配体(带有两个二异丙基膦基侧供体)显示 DHBTA 活性低于 SiNN。然而,利用 PNP 系统提供的配体优化机会,通过磷取代的变化导致发现了一种催化剂,其活性、寿命和范围远远超过了原始 SiNN 原型。在模型 PNP 系统中制备了几种 Ir 配合物,并作为催化循环中的潜在中间体进行了评估。其中,(PNP)Ir 二硼基络合物和硼基亚乙烯基络合物显示出催化能力较差,因此可能不是催化循环的一部分。
Copper-catalyzed dehydrogenative borylation of terminal alkynes with pinacolborane
作者:Erik A. Romero、Rodolphe Jazzar、Guy Bertrand
DOI:10.1039/c6sc02668k
日期:——
LCuOTf complexes [L = cyclic (alkyl)(amino)carbenes (CAACs) or N-heterocyclic carbenes (NHCs)] selectively promote the dehydrogenative borylation of C(sp)–H bonds at room temperature. It is shown that σ,π-bis(copper) acetylide and copper hydride complexes are the key catalytic species.
ZnBr<sub>2</sub>-Catalyzed Dehydrogenative Borylation of Terminal Alkynes
作者:Man Luo、Yi Qin、Xi Chen、Qian Xiao、Binlin Zhao、Weiwei Yao、Mengtao Ma
DOI:10.1021/acs.joc.1c01936
日期:2021.12.3
The simple, commercially available ZnBr2 has been successfully employed as a highly efficient and chemoselective catalyst for the dehydrogenativeborylation of terminalalkynes with HBpin under mild conditions. It shows a good tolerance toward various functional groups such as aryl, alkyl, heteroaryl, etc. The plausible reaction mechanism has been investigated based on the corresponding stoichiometric
Air- and Water-Tolerant (PNP)Ir Precatalyst for the Dehydrogenative Borylation of Terminal Alkynes
作者:Bryan J. Foley、Oleg V. Ozerov
DOI:10.1021/acs.organomet.0c00250
日期:2020.7.13
This work discloses the facile synthesis and efficacy of (PNP)IrH(OAc), a precatalyst for the dehydrogenativeborylation of terminalalkynes (DHBTA). Unlike the previously reported precatalysts in the (PNP)Ir system (PNP = diarylamido/bis(phosphine) pincer), it is air-stable in the solid state. Upon exposure to air in solution, it possesses a useful half-life on the order of 1–100 h, depending on the