Novel polymer-supported coupling/dehydrating reagents for use in organic synthesis
作者:Kathryn E. Fairfull-Smith (née Elson)、Ian D. Jenkins、Wendy A. Loughlin
DOI:10.1039/b406770c
日期:——
in high yield using the more readily prepared polymer-supported triphenylphosphine ditriflate, which was easily recovered and re-used several times without loss of efficiency. With primary alcohols, both reagents and provide an alternative to the Mitsunobu reaction, where the use of azodicarboxylates and chromatography to remove the phosphine oxide by-product can be avoided. The use of 4-dimethylaminopyridine
通过使相应的聚合物负载的氧化膦与三氟甲磺酸酐反应,制得了两种新颖的脱水剂,分别基于anhydride酸酐和三氟甲磺酸氧phosph。发现基于新的磷杂环1,1,3,3-四苯基-2-氧杂-1,3-二磷鎓双(三氟甲磺酸盐)的试剂是用于酯和酰胺形成的有用试剂。使用更容易制备的聚合物支撑的三苯基膦二三氟甲磺酸盐,可以高收率进行各种偶联/脱水型反应,例如酯,酰胺,酸酐,肽,醚和腈的形成,可轻松回收并重复使用。几次而不会损失效率。在伯醇中,这两种试剂都可以替代Mitsunobu反应,可以避免使用偶氮二羧酸盐和色谱法去除氧化膦副产物的情况。使用4-二甲基氨基吡啶可使仲醇的酯化反应以高产率进行,但保留构型。