Cobalt(I)-Mediated Preparation of Polyborylated Cyclohexadienes: Scope, Limitations, and Mechanistic Insight
作者:Anaïs Geny、David Lebœuf、Gabriel Rouquié、K. Peter C. Vollhardt、Max Malacria、Vincent Gandon、Corinne Aubert
DOI:10.1002/chem.200700337
日期:2007.6.25
proper choice of substituents allowed the preparation of 1,3-diborylated cyclohexadienes in a highly selective manner. Alternatively, 1,4-diborylated cyclohexadienes could be prepared from diborylated diynes. The scope of this reaction has been examined and found to include electron-poor, electron-rich, linear, and cyclic alkenes. The diborylated cyclohexadienes were submitted to single or double Suzuki-Miyaura
Cobalt-mediated regio- and stereoselective assembly of dienamides by hydroaminative alkyne coupling of α,ω-diynes
作者:Vincent Gandon、Corinne Aubert、Max Malacria、K. Peter C. Vollhardt
DOI:10.1039/b716841a
日期:——
In the presence of CpCo(C(2)H(4))(2), alpha,omega-diynes undergo hydroaminative coupling with amides to furnish new dienamides with control of regio- and stereochemistry.
A modular route to previously inaccessible classes of ring-fused π-extended heteroacenes bearing the heavy inorganic element tellurium (Te) is presented. These new materials can be viewed as n-doped analogs of molecular graphene subunits that exhibit color tunable visible light phosphorescence in the solid state and in the presence of air. The generalmechanism of phosphorescence in these systems was
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。
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