Hendrickson Reagent Induced Rearrangement of Aryl Propargyl Alcohols To α,β-Unsaturated Aldehydes
作者:Ziad Moussa、Ateyatallah Aljuhani
DOI:10.2174/1570178615666180329154246
日期:2018.8.8
solution (2 mL), followed by the addition of water and Et3N (2.0 mmol) and further stirring at room temperature for 1h. Subsequent workup with 5% NaHCO3 (20 mL) and purification afforded α,β- unsaturated aldehydes. Eighteen aryl propargyl alcohol substrates with a terminal α-acetylenic group were transformed in good to excellent yields (71-85%) to enals. The methodology proved successful with secondary
由三苯膦氧化物(Ph3PO)与三氟甲磺酸酐(Tf2O)(化学计量比为2:1)反应制得的Hendrickson试剂(三苯基phosph酸酐三氟甲磺酸盐)可促进脱水和各种偶联反应。该试剂已用于将肟转化为腈并通过烷氧基phosph盐的中间体制备酯,酰胺和许多其他官能团。证明该试剂可用于杂环合成噻唑啉,咪唑啉,喹啉前体,异喹啉,β-咔啉,菲啶,11Hindolo [3,2-c]喹啉,喹啉-内酯,呋喃喹啉酮和吲哚并[1,2-b]喹啉- 9(11H)-个。而且,该试剂对于成功合成几种天然产物至关重要。在室温下,在一当量的三苯基phosph酸酐三氟甲烷磺酸盐的存在下,在二氯甲烷中,带有末端α-炔基的芳基炔丙醇快速转化为相应的α,β-不饱和醛。该反应包括在0°C和N2气氛下,将新鲜蒸馏的Tf2O(1.0 mmol)添加到Ph3PO(2.0 mmol)在CH2Cl2(10 mL)中的溶液中。搅拌10分钟后,加入作为CH