The Preparation of Dimethyl α -Hydroxyphosphonates and the Chemical Shift Non-Equivalence of Their Diastereotopic Methyl Ester Groups
作者:Harry R. Hudson、Ramon O. Yusuf、Ray W. Matthews
DOI:10.1080/10426500701690905
日期:2008.6.9
alkanals, aryl aldehydes (or aryl methyl ketones), furfuraldehyde, and 2- or 3-thiophenecarboxaldehyde, respectively, thus confirming the general utility of this synthetic procedure. The 1H and 13C nmr spectra of the products exhibit characteristic chemical shift non-equivalence of the diastereotopic methyl ester groups, for which a tentative order of non-equivalence is reported and discussed.
active clusters, which encouraged us to synthesize further dibenzyl-α-diphenyl-OPP derivatives that elicited pronounced cell killing. Further structure–activity relationships showed the relevance of hydrophobicity and the position of substituents on the main benzene ring as determinants of toxicity. The most active analogs proved to be equally, or even more toxic to the multidrug resistant (MDR) cell line
Reactions of acyl phosphonates with organoaluminum reagents: a new method for the synthesis of secondary and tertiary α-hydroxy phosphonates
作者:Ozlem Seven、Sidika Polat-Cakir、Md. Shakhawoat Hossain、Mustafa Emrullahoglu、Ayhan S. Demir
DOI:10.1016/j.tet.2011.03.036
日期:2011.5
) with aryl and alkyl acyl phosphonates, which lead to the formation of α-hydroxyphosphonates in moderate to good yields, are reported. This method provides easy access to secondary and tertiary α-hydroxyphosphonates depending on the reaction conditions. The reactions of triethylaluminum with a series of acyl phosphonates at 0 °C gave the secondary α-hydroxyphosphonates, while at −100 °C they afford
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