Highly stereo- and regiocontrolled cyclopentannulation via allylphosphonate conjugate addition and hydroboration-oxidation-elimination. Synthesis of pentalenic acid with virtually complete stereo- and regiocontrol
Diastereoselective Synthesis of 2-Amino-4-phosphonobutanoic Acids by Conjugate Addition of Lithiated Schöllkopf's Bislactim Ethers to Vinylphosphonates
作者:María Ruiz、M. Carmen Fernández、Aniana Díaz、José M. Quintela、Vicente Ojea
DOI:10.1021/jo034707q
日期:2003.10.1
Conjugateadditions of lithiatedbislactimethers derived from cyclo-[Gly-Val] and cyclo-[Ala-Val] to alpha-, beta-, or alpha,beta-substituted vinylphosphonates allow direct and stereoselective access to a variety of 3- or 4-monosubstituted and 2,3-, 2,4-, or 3,4-disubstituted 2-amino-4-phosphonobutanoic acids (AP4 derivatives) in enantiomerically pure form. The relative stereochemistry was assigned
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。
Olefin Cross-Metathesis Reactions at Room Temperature Using the Nonionic Amphiphile “PTS”: Just Add Water
作者:Bruce H. Lipshutz、Grant T. Aguinaldo、Subir Ghorai、Karl Voigtritter
DOI:10.1021/ol800028x
日期:2008.4.1
cross-metathesis reactions in water, involving water-insoluble substrates, at roomtemperature and using commercially available catalysts are reported. The key to success is to include small percentages of the nonionic, vitamin E-based amphiphile "PTS". The nanometermicelles formed accommodate water-insoluble substrates, along with a readily available Ru-based metathesis catalyst. Reactions proceed
A Convenient Selenium‐Linking Strategy for Traceless Solid‐Phase Synthesis of Diethyl 1‐Alkenephosphonates
作者:Shou‐Ri Sheng、Wei Zhou、Xiao‐Ling Liu、Cai‐Sheng Song
DOI:10.1081/scc-120028631
日期:2004.12.31
Abstract Treatment of a novel polymer‐supported α‐diethoxyphosphoryl methyl selenide with LDA followed by alkylation and oxidative deselenation efficiently afforded diethyl trans‐1‐alkenephosphonates in good yields and purities.