aluminum-catalyzed hydroboration of a variety of nitriles and alkynes. Moreover, aluminum-catalyzed hydroboration is expanded to more challenging substrates such as alkene, pyridine, imine, carbodiimide, and isocyanides. More importantly, we have shown that the aluminum dihydride catalyzed both intra- and intermolecular chemoselective hydroboration of nitriles and alkynes over other reducible functionalities for
Hydroboration of alkynes and nitriles using an α-diimine cobalt hydride catalyst
作者:Hagit Ben-Daat、Christopher L. Rock、Marco Flores、Thomas L. Groy、Amanda C. Bowman、Ryan J. Trovitch
DOI:10.1039/c7cc02281f
日期:——
The κ4-diimine cobalt hydride compound, (Ph2PPrDI)CoH, has been found to catalyze E-selective alkyne hydroboration and the dihydroboration of nitriles.
Integrating Terminal CoBr
<sub>n</sub>
Salts into a 2D Cobalt(II) Coordination Polymer to Promote the
<i>β</i>
‐(
<i>E)−</i>
Selective Hydroboration of Alkynes
In the present study, 2D Co(II) coordination polymers (CP-1), which integrate terminal CoBrn (CoBr2 and CoBr3) sites immobilized on the framework, are synthesized at the gram level. As a special heterogeneous catalyst, CP-1 shows regioselectivity (β:α>99:1) and stereoselectivity (only E configuration) in the hydroboration of alkynes. The hydroboration reaction conditions are mild and cover a broad
作者:Zobernig, Daniel P.、Stöger, Berthold、Veiros, Luis F.、Kirchner, Karl
DOI:10.1021/acscatal.4c03805
日期:——
Mn(I)-catalyzed hydroboration of terminal alkynes with pinacolborane (HBPin) is described. The hydroboration reaction is highly Z-selective in the case of aryl alkynes and E-selective in the case of aliphatic alkynes. The reaction requires no additives or solvents and proceeds with a catalystloading of 1 mol % at 50–70 °C. The most active precatalyst is the bench-stable alkyl Mn(I) complex cis-[Mn(PCP
描述了末端炔烃与频那醇硼烷 (HBPin) 的立体和区域选择性 Mn(I) 催化硼氢化反应。硼氢化反应在芳基炔的情况下具有高度Z-选择性,在脂族炔的情况下具有E-选择性。该反应不需要添加剂或溶剂,催化剂负载量为 1 mol%,反应温度为 50–70 °C。最活跃的预催化剂是工作台稳定的烷基Mn(I)络合物顺式-[Mn(PCP- i Pr)(CO) 2 (CH 2 CH 2 CH 3 )]。通过将CO配体迁移插入M n -烷基键中以产生酰基中间体来引发催化过程。该物质经历炔烃(芳香族炔烃)和 HBPin(脂肪族炔烃)的 C–H 和 B–H 键断裂,形成活性 Mn(I) 炔基和硼基催化剂 [Mn(PCP- i Pr)(CO )(C=CR)]和[Mn(PCP- i Pr)(CO)(BPin)],分别。多种芳香族和脂肪族炔烃被有效且选择性地硼酸化。基于实验数据和 DFT 计算提供了机理见解。官能化烯烃可用于交叉偶联反应中的进一步应用。
[EN] EVOLUTION OF BIOACTIVE SEQUENCE-DEFINED SYNTHETIC POLYMERS USING DNA-TEMPLATED POLYMERIZATION<br/>[FR] ÉVOLUTION DE POLYMÈRES SYNTHÉTIQUES DÉFINIS PAR SÉQUENCE BIOACTIVE À L'AIDE D'UNE POLYMÉRISATION À MATRICE D'ADN