Ring-Chain Tautomerism in Organic Synthesis: Synthesis of Heterocyclic Enamines from a Novel and Practical Formal Ring Transformation Reaction of Lactones
作者:Mei-Xiang Wang、Yong Liu、Hong-Yun Gao、Yan Zhang、Chu-Yi Yu、Zhi-Tang Huang、George W. J. Fleet
DOI:10.1021/jo026560t
日期:2003.4.1
A novel approach to heterocyclic enamines has been developed from the formal ring transformation reaction of lactones. The synthesis comprises consecutive Reformatsky reaction of lactones and mesylation of the resulting mixture of ring-chain tautomers in a one-pot reaction, followed by cyclocondensation reaction with primary amines. The synthetic application of this method was demonstrated by a straightforward
从内酯的正式环转化反应已经开发出一种杂环烯胺的新方法。合成包括内酯的连续Reformatsky反应和在单锅反应中将所得的环链互变异构体混合物进行甲磺酰化,然后与伯胺进行环缩合反应。该方法的合成应用是通过N-(3-溴丙基)-取代的烯胺中间体直接制备吲哚并立定化合物来证明的。在非常温和的条件下使用廉价且容易获得的材料和试剂使这种正式的环转化方法实用且可用于制备各种杂环烯胺,这些杂环烯胺是(多)羟基化生物碱衍生物的前体。