Catalytic Asymmetric Desymmetrization of Cyclopentendiones via Diels–Alder Reaction of 3-Hydroxy-2-pyrones: Construction of Multifunctional Bridged Tricyclic Lactones
作者:Li-Min Shi、Wu-Wei Dong、Hai-Yan Tao、Xiu-Qin Dong、Chun-Jiang Wang
DOI:10.1021/acs.orglett.7b02107
日期:2017.9.1
An unprecedented asymmetric Diels–Alder reaction of 3-hydroxy-2-pyrones with prochiral cyclopentene-1,3-diones via desymmetrization was efficiently realized with high stereoselective control with the aid of fine-tunable cinchona alkaloid derived bifunctional amine–thiourea catalysts bearing multiple hydrogen-bonding donors. This protocol provides an expedient access to the multifunctional-bridged tricyclic
在高度可调节的金鸡纳生物碱衍生的双官能胺-硫脲催化剂的辅助下,通过高度立体选择性控制,有效地实现了3-羟基-2-吡喃酮与前手性环戊烯-1,3-二酮通过手性环戊烯-1,3-二酮进行的前所未有的不对称Diels-Alder反应。氢键供体。该协议可方便地访问具有四个连续的立体生成中心和一个远程的四级立体生成中心且具有广泛的底物范围的多功能桥联的三环内酯。通过开环/芳构化,可以容易地将环加合物加工成对映体富集的环戊烷-1,3-二酮。