提出了羟基膦酸酯和氨基膦酸酯的绝对构型通过与市售萘普生的双衍生作用的分配。周围的立构碳中心的空间排列和Δδ的符号之间的相关性RS通过简单比较(R)-和(S)-萘普生酯或酰胺衍生物的1 H和31 P NMR光谱,可以确定羟基和氨基膦酸酯的绝对构型。NMR研究对结构多样的萘普生酯和羟基膦酸酯和氨基膦酸酯的酰胺进行了广泛的构象分析(理论计算,低温实验),证明了可以成功使用简化的模型。
We have successfully developed a strategy for the first time for the enantioselective Rh-TaniaPhos catalyzed asymmetric hydrogenation of unprotected β-enamine phosphonates to free β-amino phosphonates directly with good enantioselectivities (80%–86% ee) and high conversions (>99% conversion). The resulting chiral free β-amino phosphonates and their derivatives are important intermediates in biochemistry
as a catalyst. This method was used to obtain a series of chiral α-sulfonyl-β-aminophosphonates in yields of up to 96% with 89:11 dr and 88% ee. These compounds were further transformed into β-aminophosphonates or chiral azetidines with various functional groups by a Horner–Wadsworth–Emmons/aza-Michael addition reaction sequence.
The Assignment of the Absolute Configuration of Diethyl Hydroxy- and Aminophosphonates by <sup>1</sup>H and <sup>31</sup>P NMR Using Naproxen as a Reliable Chiral Derivatizing Agent
作者:Katarzyna Błażewska、Piotr Paneth、Tadeusz Gajda
DOI:10.1021/jo062097z
日期:2007.2.1
The assignment of the absoluteconfiguration of hydroxy- and aminophosphonates by their double derivatization with commercially available naproxen is presented. The correlation between the spatial arrangement around the stereogenic carbon center and the signs of the ΔδRS allows determination of the absoluteconfiguration of hydroxy- and aminophosphonates by simple comparison of the 1H and 31P NMR spectra
提出了羟基膦酸酯和氨基膦酸酯的绝对构型通过与市售萘普生的双衍生作用的分配。周围的立构碳中心的空间排列和Δδ的符号之间的相关性RS通过简单比较(R)-和(S)-萘普生酯或酰胺衍生物的1 H和31 P NMR光谱,可以确定羟基和氨基膦酸酯的绝对构型。NMR研究对结构多样的萘普生酯和羟基膦酸酯和氨基膦酸酯的酰胺进行了广泛的构象分析(理论计算,低温实验),证明了可以成功使用简化的模型。
A Facile Synthesis of Optically Active ?-Amino-?-arylethylphosphonates by Mitsunobu Reaction
作者:Chengfu Xu、Chengye Yuan
DOI:10.1002/ejoc.200400420
日期:2004.11
We describe a convenient and simple synthesis of opticallyactive β -amino-β-arylethylphosphonates based on Mitsunobe reactions of chiral β-aryl-β-hydroxyethylphosphonates, prepared in turn by Candida rugosa lipase catayzed kinetic resolution of the corresponding racemates.