Highly efficient palladium-catalyzed cross-coupling of diarylborinic acids with arenediazoniums for practical diaryl synthesis
作者:Fengze Wang、Chen Wang、Guoping Sun、Gang Zou
DOI:10.1016/j.tetlet.2019.151491
日期:2020.2
A highly efficient cross-coupling of cost-effective diarylborinic acids with both isolatable and latent arenediazoniums, i.e. tetrafluoroborates and aryltriazenes, respectively, has been developed with a practical palladium catalyst system under base-free conditions in open flask at room temperature. A variety of electronically and sterically various biaryls, in particular, those bearing a coordinative
Electrochemical Synthesis of Biaryls via Oxidative Intramolecular Coupling of Tetra(hetero)arylborates
作者:Arif Music、Andreas N. Baumann、Philipp Spieß、Allan Plantefol、Thomas C. Jagau、Dorian Didier
DOI:10.1021/jacs.9b12300
日期:2020.3.4
scope, scalability and robustness of this unconventional catalyst-free transformation, leading to functional-ized biaryls and ultimately furnishing drug-like small molecules as well as late stage derivatization of natural compounds. In addition, the observed selectivity of the oxidative coupling reaction is related to the electronic structure of the TABs through quantum-chemical calculations and experimental
Base-assisted, copper-catalyzed N-arylation of (benz)imidazoles and amines with diarylborinic acids
作者:Changwei Guan、Yuanyuan Feng、Gang Zou、Jie Tang
DOI:10.1016/j.tet.2017.10.043
日期:2017.12
cost-effective aryl source has been efficiently effected via Cu(OAc)2-catalyzed Chan-Lam coupling in assistance of tetramethylethylenediamine (TMEDA) in methanol and pyridine (Py) in dichloromethane, respectively, in air at room temperature. The diarylborinic acids could be well accommodated by the Chan-Lam coupling oxidative conditions containing a proper combination of bases and solvents. The steric
Stereospecific β‐l‐rhamnopyranosylations were conducted using a 1,2‐anhydro‐l‐rhamnopyranose donor and mono‐ol or diol acceptors in the presence of a glycosyl‐acceptor‐derived borinic or boronic ester. Reactions proceeded smoothly to provide the corresponding β‐l‐rhamnopyranosides (β‐l‐Rhap) with complete stereoselectivity in moderate to high yields without any further additives under mild conditions
立体特异性β-升-rhamnopyranosylations使用1,2-脱水-进行升-rhamnopyranose供体和单醇或糖基-受体衍生的二取代硼酸或硼酸酯的存在下二醇受体。反应进行得很顺利,可以提供相应的β- 1-鼠李糖吡喃糖苷(β- 1- Rha p),在中等至高收率下具有完全的立体选择性,在温和条件下无需任何其他添加剂。使用13 C动力学同位素效应(KIE)测量和DFT计算的硼酸酯介导糖基化机理研究与一致的S N一致i机制具有爆炸的过渡状态。另外,本糖基化方法被成功地应用于三糖的合成,α-升-RHA p - (1,2)-β-升-RHA p - (1,4)-Glc p,衍生自肺炎链球菌血清型7B,7C和7D。
Borinic acid catalysed peptide synthesis
作者:Tharwat Mohy El Dine、Jacques Rouden、Jérôme Blanchet
DOI:10.1039/c5cc06177f
日期:——
2-Chlorophenylborinic acid is reported to catalyze dipeptide synthesis in the presence of molecular sieves with no racemization.