An Effective Use of Benzoic Anhydride and Its Derivatives for the Synthesis of Carboxylic Esters and Lactones: A Powerful and Convenient Mixed Anhydride Method Promoted by Basic Catalysts
作者:Isamu Shiina、Mari Kubota、Hiromi Oshiumi、Minako Hashizume
DOI:10.1021/jo030367x
日期:2004.3.1
4-(dimethylamino)pyridine. A similar reaction occurs with triethylamine when using a catalytic amount of 4-(dimethylamino)pyridine 1-oxide as an effective promoter for the intramolecular condensation reaction. These methods are successfully applied to the synthesis of erythro-aleuritic acid lactone and an eight-membered-ring lactone moiety of octalactins A and B. The efficiency of the cyclizations is
使用2-甲基-6-硝基苯甲酸酐和三乙胺,通过促进碱性催化剂(例如4-(二甲基氨基)吡啶),由几乎等摩尔量的羧酸和醇在室温下以高收率和高化学选择性获得各种羧酸酯。在4-(二甲基氨基)吡啶存在下,使用2-甲基-6-硝基苯甲酸酐,在室温下由相应的ω-羟基羧酸高产率地制备了多种内酯。当使用催化量的4-(二甲基氨基)吡啶1-氧化物作为分子内缩合反应的有效促进剂时,三乙胺也会发生类似的反应。这些方法已成功应用于赤藓红的合成-八聚肌动蛋白A和B的八聚环戊二酸酯内酯和一个八元环内酯部分。将环化的效率与其他报道的内酯化的效率进行了比较。