A Straightforward, Purification-Free Procedure for the Synthesis of Ando and Still–Gennari Type Phosphonates
作者:Ignacy Janicki、Piotr Kiełbasiński
DOI:10.1055/a-1628-7586
日期:2022.1
Z-Selective Still–Gennari and Ando modifications of the typically E-selective Horner–Wadsworth–Emmons reaction are highly valuable synthetic tools in organic chemistry. These procedures are based on application of bis(2,2,2-trifluoroethyl) phosphonates or diaryl phosphonates, respectively, for the olefination of carbonyl groups. In our research, we present an improved, straightforward, purification-free
典型的 E 选择性 Horner-Wadsworth-Emmons 反应的 Z-选择性 Still-Gennari 和 Ando 修饰是有机化学中非常有价值的合成工具。这些程序基于分别应用双(2,2,2-三氟乙基)膦酸酯或二芳基膦酸酯用于羰基的烯化。在我们的研究中,我们提出了一种改进的、直接的、免纯化的合成这些试剂的程序。我们程序的关键步骤是使二氯化膦与适当的醇钠反应,从而在克规模上产生 52-97% 的分离产率。整个三步过程在一锅中进行。最重要的是,经过简单萃取后,产品纯度超过95%,避免了柱层析和蒸馏。而且,