作者:Natalie E. Campbell、Glenn M. Sammis
DOI:10.1002/anie.201403234
日期:2014.6.10
The highly efficient and diastereoselective synthesis of E dienes has been accomplished through radical cyclization of bromoallyl hydrazones. This methodology has been further extended to generate these products through a one‐pot condensation/radical cyclization/cycloreversion cascade from simple aldehyde starting materials in high yields (>75 %) and high diastereoselectivities (>95:5). Mechanistic
E 二烯的高效和非对映选择性合成是通过溴代烯丙基的自由基环化完成的。通过单罐缩合/自由基环化/环还原级联反应,从简单的醛原料中以高收率(> 75%)和高非对映选择性(> 95:5)扩展了该方法,以生成这些产物。机理研究表明,级联反应在环还原之前通过环状重氮中间体进行。