Highly Regio- and Stereoselective Synthesis of Nine- to Twelve-Membered Cyclic Compounds by a Pd<sup>0</sup>-Catalyzed Cyclization Reaction between Allenes with a Nucleophilic Functionality and Organic Halides
作者:Xinpeng Jiang、Qing Yang、Yihua Yu、Chunling Fu、Shengming Ma
DOI:10.1002/chem.200900972
日期:2009.7.27
Simple cyclization: A novel method has been developed for the highly regio‐ and stereoselective synthesis of nine‐ to twelve‐membered cyclic compounds by a Pd0‐catalyzed cyclization reaction of allenes with a carbon or nitrogen nucleophilic functionality. Oxidative addition and carbopalladation gave anti‐π‐allyl palladium intermediates, then an exclusive intramolecular nucleophilic attack at the terminal
简单环化:已开发出一种新方法,可通过Pd 0催化具有碳或氮亲核官能团的烯的环化反应,对9至12元环化合物进行高度区域和立体选择性合成。氧化加成和碳钯反应制得抗-π-烯丙基钯中间体,然后在丙二烯部分末端碳原子处的分子内亲核排他性进攻使E产物收率很高(参见方案; Ts =甲苯磺酰基; DMA = N,N-二甲基乙酰胺)。