Studies on Organophosphorus Compounds, 53: A New Procedure for the Synthesis of 1-Alkyl or 1-Aryl-1-hydroxy-2-nitroethylphoshonates under PTC Conditions
A series of dialkyl 1-alkyl- or 1-aryl-1-hydroxy-2-nitroethyl-phosphonates and 1-hydroxy-1-(nitromethyl)alkylphosphonates was prepared by nucleophilic addition of nitromethane to dialkyl acylphosphonates in the presence of potassium carbonate and tetrabutylammonium bromide.
Organocatalytic Highly Enantioselective Nitroaldol Reaction of α-Ketophosphonates and Nitromethane
作者:Tanmay Mandal、Sampak Samanta、Cong-Gui Zhao
DOI:10.1021/ol070209i
日期:2007.3.1
[reaction: see text] The first organocatalytichighlyenantioselective nitroaldol reaction of alpha-ketophosphonates and nitromethane has been realized by using cupreine (2) or 9-O-benzylcupreine (3) as the catalyst. Both catalysts are highly reactive and highlyenantioselective. alpha-Hydroxy-beta-nitrophosphonates have been synthesized in good yields and excellent enantioselectivities (>or=90% ee) at a low
Enantioselective synthesis of diisopropyl α-, β-, and γ-hydroxyarylalkylphosphonates from ketophosphonates: A study on the effect of the phosphonyl group
作者:Chris Meier、Wolfgang H.G. Laux
DOI:10.1016/0040-4020(95)00855-1
日期:1996.1
conditions to an enantioselective synthesis of diisopropyl α-, β- and γ-hydroxyphosphonates 4–6 by 1.3.2-oxazaborolidine catalysis using catecholborane 7 or BH3·Me2S 8 is described. The comparison to acetophenone reductions gave information's on the effect of the phosphonyl group during the reduction of ketophosphonate. So very efficient syntheses to chiral dialkyl α-, β- and γ-hydroxyphosphonates were
描述了使用儿茶酚硼烷7或BH 3 ·Me 2 S 8通过1.3.2-恶唑硼烷催化的不同还原条件与对映体选择性合成α-,β-和γ-羟基磷酸二异丙酯4-6的比较。与苯乙酮还原的比较给出了在酮膦酸酯还原过程中膦酰基的作用的信息。因此,精心设计了非常高效的手性二烷基α-,β-和γ-羟基膦酸酯的合成方法。
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。
gem-Diphosphonate and gem-phosphonate-phosphate compounds with specific high density lipoprotein inducing activity
作者:Nguyen Lan Mong、Eric Niesor、Craig L. Bentzen
DOI:10.1021/jm00391a027
日期:1987.8
New diphosphonate compounds and related derivatives were synthesized and investigated for their activity in specifically inducing plasma high density lipoproteins (HDL) and high density lipoprotein cholesterol (HDL-C) in normal rats. The screening of numerous compounds has permitted the determination of the structural variations leading to optimal plasma lipid altering activity, indicating antiatherosclerotic potential. Among the compounds observed to be the most active, dimethyl alpha-(dimethoxyphosphinyl)-p-chlorobenzyl phosphate (20, SR-202, mifobate) was selected for further pharmacological and subsequent clinical development.