A Convenient (E)-Stereoselective Synthesis of Alkenylphosphonates
摘要:
Diethyl (E)-alkenylphosphonates have been prepared stereoselectively by dehydration of the corresponding beta-hydroxyphosphonates using DCC/CuCl2 in refluxing toluene. Starting beta-hydroxyphosphonates were obtained in high yield from diethyl methylphosphonate.
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。
Decarbonylative Phosphorylation of Carboxylic Acids via Redox-Neutral Palladium Catalysis
We describe the direct synthesis of organophosphorus compounds from ubiquitous aryl and vinyl carboxylic acids via decarbonylative palladium catalysis. The catalytic system shows excellent scope and tolerates a wide range of functional groups (>50 examples). The utility of this powerful methodology is highlighted in the late-stage derivatization directly exploiting the presence of the prevalent carboxylic
An efficient and novel method was developed towards the synthesis of alkenylphosphonates from simple olefins and phosphonate diesters. This method was enabled by the use of cheap and commercially available silver salts and TEMPO. This method exhibits of good functional group tolerance, specific (E)‐selectivity for all olefins and vinyl‐selectivity for aliphatic olefins. A radical mechanism was proposed
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。
A Stereoselective Synthetic Route to (<i>E</i>)-2-Arylvinylphosphonates
作者:Ping Zhong、Xian Huang、Zhi-Xing Xiong
DOI:10.1055/s-1999-2727
日期:1999.6
Terminal alkynes 1 react with Cp2Zr(H)Cl (Cp = η5-C5C5) to give organozirconium(IV) complexes 2, which are trapped with dialkyl chlorophosphates to afford (E)-arylvinylphosphonates 3.