A modular olefination reaction between aldehydes and diborylsilylmethide lithium salts
作者:Oriol Salvado、Elena Fernández
DOI:10.1039/d1cc01882e
日期:——
We describe the preparation of densely functionalised 1,1-silylborylated trisubstituted alkenes, via a boron-Wittig reaction, between LiC(Bpin)2(SiMe3) and aliphatic or aromatic aldehydes. The condensation of diborylsilylmethide lithium salts with α,β-unsaturated aldehydes provides a direct pathway to synthesize 1,1-silylborylated conjugated dienes and diynes.
Copper-Catalyzed Monoborylation of Silylalkynes; Regio- and Stereoselective Synthesis of (<i>Z</i>)-β-(Borylvinyl)silanes
作者:Yeong Mi Chae、Jun Sung Bae、Jong Hun Moon、Jin Yong Lee、Jaesook Yun
DOI:10.1002/adsc.201300881
日期:2014.3.10
The selective copper‐catalyzed borylation of silylalkynes in the presence of a diboron reagent and methanol produced a variety of (Z)‐β‐(borylvinyl)silanes. The appropriate use of a selective ligand for copper allows the chemo‐, regio‐, and stereoselectivemonoborylation of silylalkynes. The β‐regioselectivity of an N‐heterocyclic carbene (NHC)‐copper catalyst was investigated by DFT calculations.
Hydroboration of alkynes initiated by sodium triethylborohydride
作者:Anna M. Maj、Bartłomiej Szarłan、Piotr Pawluć、Maciej Zaranek
DOI:10.1016/j.poly.2022.115961
日期:2022.9
hydride transferring reagent, is commonly used as an activating agent for hydroboration catalysts based on the first-row transition metal complexes. It has been found that NaHBEt3 can be a selective catalyst for hydroboration of terminalalkynes with pinacolborane. Hydroboration of aromatic and aliphatic alkynes in the presence of 10 mol% of NaHBEt3 proceeded in a highlyselective manner to give (E)-vinylboronate
三乙基硼氢化钠是一种常用的氢化物转移试剂,通常用作基于第一排过渡金属配合物的硼氢化催化剂的活化剂。已经发现NaHBEt 3可以是一种选择性催化剂,用于用频哪醇硼烷对末端炔烃进行硼氢化。在 10 mol% NaHBEt 3存在下,芳香族和脂肪族炔烃的硼氢化以高选择性方式进行,以高收率得到 ( E )-乙烯基硼酸酯,而乙炔基硅烷在该过程中似乎反应性较低。内部炔烃也可以转化为相应的乙烯基硼酸酯,但是,与末端对应物相比,该过程需要更长的反应时间。