Pd-catalyzed carbonylative access to aroyl phosphonates from (hetero)aryl bromides
作者:Zhong Lian、Hongfei Yin、Stig D. Friis、Troels Skrydstrup
DOI:10.1039/c5cc02085a
日期:——
This first carbonylative coupling employing a phosphorus-based nucleophile provides easy and safe access to acyl phosphonates under mild conditions.
这种首次使用磷基亲核试剂的羰基化偶联反应在温和条件下提供了对酰基膦酸酯的简便安全访问。
Asymmetric Hydrogenation of α-Keto Phosphonates with Chiral Palladium Catalysts
作者:Nataliya S. Goulioukina、Grigorii N. Bondarenko、Alexei V. Bogdanov、Konstantin N. Gavrilov、Irina P. Beletskaya
DOI:10.1002/ejoc.200800943
日期:2009.2
Under atmospheric hydrogen pressure, a catalytic amount of palladium(II) trifluoroacetate and (R)-MeO-BIPHEP in 2,2,2-trifluoroethanol promoted the asymmetrichydrogenation of diisopropyl α-ketophosphonates 1 to afford the corresponding α-hydroxy phosphonates 2 in excellent yields and with a moderate enantioselectivities of up to 55 % ee. Racemic α-aryl-α-hydroxy phosphonates can be prepared by using
Imidazolium ion tethered TsDPENs as efficient ligands for Iridium catalyzed asymmetric transfer hydrogenation of α-keto phosphonates in water
作者:Mengxia Sun、Joann Campbell、Guowei Kang、Huigang Wang、Bukuo Ni
DOI:10.1016/j.jorganchem.2016.03.010
日期:2016.5
Iridium-catalyzed asymmetric transfer hydrogenation (ATH) of α-ketophosphonates in water. The reaction provided the desired product α-hydroxyphosphonates in moderate to good yields (44–78%) and good to excellent enantioselectivities (up to >99% ee) under mild reaction conditions without adding any surfactants. The enantiomeric excess was determined by 13P NMR by using (−)-cinchonidine as chiral solvating agent
首次,通过使用咪唑鎓离子束缚的TsDPENs作为铱在水中α-酮膦酸酯的铱催化的不对称转移氢化(ATH)的有效配体,开发了一种有效的方法。该反应在不添加任何表面活性剂的条件下,在温和的反应条件下,以中等至良好的收率(44-78%)和良好至出色的对映选择性(高达> 99%ee)提供了所需的产物α-羟基膦酸酯。通过使用(-)-金可尼定作为手性溶剂化剂,通过13 P NMR测定对映体过量,这是一种比手性HPLC更方便的方法。
Asymmetric synthesis of chiral, Nonracemic dialkyl-α-hydroxyalkylphosphonates via a (−)-Chlorodiiso-pinocampheylborane (Ipc2B-Cl) reduction
作者:Chris Meier、Wolfgang H.G. Laux
DOI:10.1016/0957-4166(95)00424-6
日期:1996.1
The enantioselective synthesis of dialkyl α-hydroxybenzylphosphonates 2 using a (−)-chlorodiisopinocampheylborane (Ipc2B-Cl) 3 catalyed reduction starting with α-keto-phosphonates 1 is described. The reaction gave the target compounds 2 in good yields with predictable stereochemistry and enantiomeric excesses up to 65% ee.
Visible-light-induced coupling of carboxylic acids with alcohols/amines via a phosphorous linchpin strategy
作者:Qiupeng Peng、Achyut Ranjan Gogoi、Ángel Rentería-Gómez、Osvaldo Gutierrez、Karl A. Scheidt
DOI:10.1016/j.chempr.2023.04.011
日期:2023.7
organic chemistry and has been well developed over the past century. These dehydrations are extensively used in medicinal chemistry and natural product synthesis due to the prevalence of these functional groups in bioactive molecules. Here, we report a divergent process from the expected ester/amide outcomes through a light-induced coupling of activated carboxylic acids and alcohols/amines to efficiently