Diastereoselective synthesis of aryl and alkyl trans-glycidic amides from pseudoephedrine-derived sulfonium salt. Chemospecific exo-tet ring closure for morpholin-3-ones
作者:David M. Aparicio、Dino Gnecco、Jorge R. Juárez、María L. Orea、Angel Mendoza、Noemí Waksman、Ricardo Salazar、Marcos Fores-Alamo、Joel L. Terán
DOI:10.1016/j.tet.2012.09.047
日期:2012.12
A regiospecific and high diastereoselective synthesis of trans-glycidic amides coming from a common pseudoephedrine sulfonium salt 2 precursor is presented. This is the first example in where the diastereoselectivity is controlled by a chiral noncyclic amide fragment. The epoxidation reaction provides alkyl or aryl glycidic amides in good to excellent yields and exclusive trans selectivity. Finally
提出了一种来自普通伪麻黄碱salt盐2前体的反式缩水甘油酰胺的区域专一性和高非对映选择性合成。这是第一个非对映选择性受手性非环状酰胺片段控制的例子。环氧化反应以良好或优异的产率和排他的反选择性提供了烷基或芳基缩水甘油酰胺。最后,通过反式环氧酰胺的化学特异的6- exo - tet环闭合,我们获得了以优异的化学和立体化学收率密集地官能化的吗啉3-酮。