内部炔烃与二溴异氰尿酸/ H 2 O反应,得到α,α-二溴酮和1,2-二酮衍生物。具有活化基团的二芳基炔烃提供1,2-二酮衍生物作为主要产物,而具有非活化基团的二芳基炔烃或烷基芳基炔烃提供的α,α-二溴酮衍生物为主要产物。此外,带有失活基团的二芳基炔烃可提供1,2-二溴烯烃。该反应在室温下进行,并且在大多数情况下显示出良好的产率。已经基于实验观察和密度泛函理论(DFT)计算提出了反应途径。
An efficient Pd-catalyzed copper and amine free coupling reaction of acetylene and aryl bromides was achieved with calcium carbide as an acetylene source, using inorganic base and easily prepared, air-stable aminophosphine ligand in common organic solvents, providing symmetric diaryl ethynes in one-pot with yields ranged from moderate to excellent.
Nickel-Catalyzed Enantioselective α-Alkenylation of <i>N</i>-Sulfonyl Amines: Modular Access to Chiral α-Branched Amines
作者:Lun Li、Yu-Cheng Liu、Hang Shi
DOI:10.1021/jacs.1c00622
日期:2021.3.24
α-branched amines are common structural motifs in functional materials, pharmaceuticals, and chiral catalysts. Therefore, developing efficient methods for preparing compounds with these privileged scaffolds is an important endeavor in synthetic chemistry. Herein, we describe an atom-economical, modular method for a nickel-catalyzed enantioselective α-alkenylation of readily available linear N-sulfonyl amines
A rhodium-catalyzed hydroformylation of alkynes with formic acid was developed. The method provides α,β-unsaturated aldehydes in high yield and E-selectivity without the need to handle toxic CO gas.
Versatile Pyrrole Synthesis through Ruthenium(II)-Catalyzed Alkene C–H Bond Functionalization on Enamines
作者:Lianhui Wang、Lutz Ackermann
DOI:10.1021/ol303224e
日期:2013.1.4
An efficient ruthenium(II) catalyst enabled broadly applicable oxidative alkyne annulations with electron-rich enamines to provide diversely decorated pyrroles, even in an aerobic fashion with air as the ideal oxidant.
2-trimethylsilylphenylboronic acid with internal alkynes is developed for the synthesis of 2,3-disubstituted benzosilole derivatives. A range of functional groups, encompassing ketones, esters, amines, aryl bromides, and heteroarenes, are compatible, which provides rapid access to diverse benzosiloles. Sequential 2-fold coupling enablesmodularsynthesis of asymmetrically substituted 1,5-dihydro-1,5-disila-s-indacene