Synthesis of Quaternary<i>α</i>-Hydroxy Phosphonates<i>via</i>Direct Hydroxylation of Phosphonate Compounds
作者:Jiyan Liu、Wei Wang、Rui Wang、Lijun Gu
DOI:10.1002/cjoc.201400858
日期:2015.5
It was found for the first time that Cs2CO3 serves as highly efficient catalyst for the direct hydroxylation reactions of phosphonates under mild conditions. This reaction provides an efficient approach to quaternary α‐hydroxy phosphonates, which possess intriguing biological activities and are widely used in many areas.
首次发现在温和条件下,Cs 2 CO 3可以用作膦酸酯直接羟基化反应的高效催化剂。该反应提供了一种有效的方法来处理季铵化的α-羟基膦酸酯,其具有令人着迷的生物学活性,并在许多领域得到了广泛的应用。
Highly Efficient Synthesis of Quaternary α-Hydroxy Phosphonates<i>via</i>Lewis Acid-Catalyzed Hydrophosphonylation of Ketones
A Lewis acid catalyst has been first applied to the hydrophosphonylation of ketones, giving the corresponding quaternary α-hydroxy phosphonates in high yields (up to 98%). The present method was highly tolerable for functionalized ketones. Moreover, the first catalytic enantioselective hydrophosphonylation of an unactivated ketone was also realized by using a tridentate Schiff base-titanium complex
Solvent-Free Synthesis of Tertiaryα-Hydroxyphosphates by the Triethylamine-Catalyzed Hydrophosphonylation of Ketones
作者:Chubei Wang、Jianwei Zhou、Xingbin Lv、Junlei Wen、Hongwu He
DOI:10.1080/10426507.2013.765874
日期:2013.10.1
A new, environmentally benign, convenient, and easy method of synthesizing tertiary -hydroxyphosphonates by the triethylamine-catalyzed hydrophosphonylation of unactivated ketones was developed. In the presence of triethylamine, aromatic or heteroaromatic ketones can react with phosphite to form tertiary -hydroxyphosphonates under solvent-free and mild conditions. The proposed method was also suitable for functionalized ketones.
C–H Hydroxylation of Phosphonates with Oxygen in [bmIm]OH To Produce Quaternary α-Hydroxy Phosphonates
作者:Xiangguang Li、Cheng Jin、Lijun Gu
DOI:10.1021/jo502883q
日期:2015.2.20
A highly efficient and mild [bmIm]OH-catalyzed a-hydroxylation of phosphonates using O-2 as the oxygen source is described. The employment of ionic liquid under mild reaction conditions makes this transformation green and practical. Especially, this reaction provided a novel and convenient methodology for the construction of quaternary a-hydroxy phosphonates.
The catalytic aerobic synthesis of quaternary α-hydroxy phosphonates via direct hydroxylation of phosphonate compounds
作者:Lijun Gu、Cheng Jin、Hongtao Zhang
DOI:10.1039/c4nj02072c
日期:——
A highly efficient Cu-catalyzed direct hydroxylation of phosphonate compounds has been developed. This transformation provides a powerful method for the synthesis of quaternary α-hydroxyphosphonates in good yields. The direct transformation process, regiospecific selectivity, and good tolerance to a variety of substituents make it an alternative approach to the reported protocols.