Stereoselective Cascade Formal Nucleophilic Substitution and Mannich Reaction of Ethyl 2-Aroyl-1-chlorocyclopropanecarboxylates
作者:Min Zhang、Fan Luo、Yuefa Gong
DOI:10.1021/jo402739f
日期:2014.2.7
A highly regio- and diastereoselective cascade formal nucleophilic substitution and Mannich reaction of ethyl 2-aroyl-1-chlorocyclopropanecarboxylates with salicylaldimines is described. Under basic conditions, ethyl 2-aroyl-1-chlorocyclopropanecarboxylate is easily converted into a cyclopropene intermediate via simple 1,2-elimination of hydrogen chloride. The highly reactive cyclopropene quickly combines
描述了2-芳酰基-1-氯环丙烷甲酸乙酯与水杨醛亚胺的高度区域和非对映选择性的级联形式亲核取代和曼尼希反应。在碱性条件下,通过简单的1,2-氯化氢消除,2-芳基-1-氯环丙烷甲酸乙酯很容易转化为环丙烯中间体。高反应性的环丙烯通过在选择性的C═C键上进行区域选择性氧杂加,然后在C═N键上进行非对映选择性加成,迅速与水杨醛亚胺结合,一次形成C-O和C-C键。这提供了用于构象约束的顺式-四氢环丙烷[ b ]亚甲基衍生物的高度立体选择性的新方法。