HandaPhos: A General Ligand Enabling Sustainable ppm Levels of Palladium-Catalyzed Cross-Couplings in Water at Room Temperature
作者:Sachin Handa、Martin P. Andersson、Fabrice Gallou、John Reilly、Bruce H. Lipshutz
DOI:10.1002/anie.201510570
日期:2016.4.11
complexed in a 1:1 ratio with Pd(OAc)2, enables Pd‐catalyzed cross‐couplings to be run using ≤1000 ppm of this pre‐catalyst. Applications to Suzuki–Miyaura reactions involving highly funtionalized reaction partners are demonstrated, all run using environmentally benign nanoreactors in water at ambient temperatures. Comparisons with existing state‐of‐the‐art ligands and catalysts are discussed herein.
Catalytic Dehydrogenative Borylation of Terminal Alkynes by a SiNN Pincer Complex of Iridium
作者:Chun-I Lee、Jia Zhou、Oleg V. Ozerov
DOI:10.1021/ja311682c
日期:2013.3.6
catalytic dehydrogenativeborylation of carbon-hydrogen bonds with dialkoxyboranes (RO)2BH is particularly attractive. It has been demonstrated for a variety of carbon-hydrogen bond types but not for the C(sp)-H bonds of terminalalkynes, for which hydroboration of the triple bond is a competing process. We report a new iridium catalyst that is strictly chemoselective for C-H borylation of terminal alkynes
具有碳硼键的化合物是通用中间体,可通过将碳硼键加工成其他碳元素键来构建更复杂的分子。通过碳-氢键与二烷氧基硼烷 (RO)2BH 的催化脱氢硼酸化合成碳-硼键特别有吸引力。它已被证明适用于各种碳氢键类型,但不适用于末端炔烃的 C(sp)-H 键,因此三键的硼氢化是一个竞争过程。我们报告了一种新的铱催化剂,它对末端炔烃的 CH 硼酸化具有严格的化学选择性。这种催化剂成功的关键似乎是新的辅助 SiNN 钳配体,它结合了酰胺基、喹啉和甲硅烷基供体,并产生结构上不寻常的 Ir 配合物。
Photochemical [2+2] Cycloaddition of Alkynyl Boronates
作者:Oleksandr S. Liashuk、Oleksandr O. Grygorenko、Yulian M. Volovenko、Jérôme Waser
DOI:10.1002/chem.202301650
日期:2023.9.26
A photochemical [2+2] cycloaddition of alkynyl boronates and maleimides is described as a convenient method for the synthesis of polysubstituted borylated cyclobutenes tolerating a wide range of functional groups. Physicochemical and structural properties of the products obtained provide rationale for their application as phthalimide isosteric replacements, for example, in Thalidomide. Mechanistic
Synthesis of Triborylalkenes from Terminal Alkynes by Iridium-Catalyzed Tandem CH Borylation and Diboration
作者:Chun-I Lee、Wei-Chun Shih、Jia Zhou、Joseph H. Reibenspies、Oleg V. Ozerov
DOI:10.1002/anie.201507372
日期:2015.11.16
reaction to convert terminalalkynes into triborylalkenes is reported. In the first step, the terminalalkyne and pinacolborane (HBpin) are converted into an alkynylboronate, which is catalyzed by an iridium complex supported by a SiNN pincer ligand. In the second step, treatment of the reaction mixture with CO generates a new catalyst which mediates dehydrogenative diboration of alkynylboronate with