Nucleophilic Substitution Reactions of (Alkoxymethylene)dimethylammonium Chloride
作者:Anthony G. M. Barrett、D. Christopher Braddock、Rachel A. James、Nobuyuki Koike、Panayiotis A. Procopiou
DOI:10.1021/jo980583j
日期:1998.9.1
The use of imidate esters as potential replacements for diethyl azodicarboxylate and triphenylphosphine in the Mitsunobu reaction is described. A series of secondary alcohols were allowed to react with (chloromethylene)dimethylammonium chloride, generated from dimethylformamide (DMF) and oxalyl chloride, to give imidate esters. Reaction of these salts with potassium benzoate or potassium phthalimide
描述了在Mitsunobu反应中使用亚氨酸酯作为偶氮二羧酸二乙酯和三苯基膦的潜在替代物。使一系列仲醇与由二甲基甲酰胺(DMF)和草酰氯生成的(氯亚甲基)二甲基氯化铵反应,得到亚氨酸酯。这些盐与苯甲酸钾或邻苯二甲酰亚胺钾的反应以极好的收率得到了S(N)2取代的产物,且立体化学清晰易懂。讨论了反应条件的优化,作为通过减少所需亲核试剂的量来增加该方法的原子经济性的手段。