Stereoselective synthesis of vinylphosphonates and phosphine oxides via silver-catalyzed phosphorylation of styrenes
作者:Qingwen Gui、Liang Hu、Xiang Chen、Jidan Liu、Ze Tan
DOI:10.1039/c5cc04826e
日期:——
An efficient and stereoselectivesynthesis of vinylphosphonates and phosphine oxides was developed starting from styrenes using AgNO3 as the catalyst and K2S2O8 as the oxidant. Various vinyl-phosphonates and phosphine oxides were synthesized in good yields with excellent regioselectivity.
从苯乙烯开始,使用AgNO 3作为催化剂,K 2 S 2 O 8作为氧化剂,开发了一种有效的立体选择性合成乙烯基膦酸酯和氧化膦的方法。以良好的产率和优异的区域选择性合成了各种乙烯基膦酸酯和氧化膦。
Synthesis of Vinyl- and Allylphosphonates by Olefin Cross-Metathesis
作者:Arnab K. Chatterjee、Tae-Lim Choi、Robert H. Grubbs
DOI:10.1055/s-2001-14654
日期:——
prepared for the first time via intermolecular olefincross-metathesis (CM) using 1,3-dimesityl-4,5-dihydro-imidazol-2-ylidene ruthenium alkylidene complex 3 in good yield. A variety of terminal olefins, styrenes, and geminally disubstituted olefins have been successfully employed in these reactions. In addition, CM of vinylphosphonates provide exclusive E olefin stereochemistry.
取代的烯丙基和乙烯基膦酸酯首次通过分子间烯烃交叉复分解 (CM) 使用 1,3-dimesityl-4,5-dihydro-imidazol-2-ylidene 钌亚烷基配合物 3 以良好的收率制备。各种末端烯烃、苯乙烯和孪生双取代烯烃已成功用于这些反应中。此外,乙烯基膦酸酯的 CM 提供独特的 E 烯烃立体化学。
Cu(<scp>i</scp>)/Fe(<scp>iii</scp>)-Catalyzed C–P cross-coupling of styrenes with H-phosphine oxides: a facile and selective synthesis of alkenylphosphine oxides and β-ketophosphonates
作者:Jian Gu、Chun Cai
DOI:10.1039/c7ob00505a
日期:——
Cu(I)/Fe(III)-Catalyzed phosphorylation and oxyphosphorylation of styrenes with H-phosphonates which can be controlled by varying the reaction temperature are developed. This study offers a new and expedient strategy for the synthesis of useful alkenylphosphine oxides and β-ketophosphonates in satisfactory yields. Moreover, the transformation is proposed to proceed via a radical process and exhibits
Interestingly, when using activatedaryl bromides the palladium loading could be lowered to only 0.25 mol%. While highlyactive when coupling aryl iodides (i.e. only 0.15 mol% required), the PdO/SiO2 catalyst was found to be inactive when considering aryl bromides. Deep study of this catalytic material revealed that in the case of aryl bromides, absence of in situ reduction of the catalyst precursor prevents