Asymmetric Catalysis Using Modularly Designed Organocatalysts: Synthesis of Fused Tricyclic Pyrano‐Pyrano[2,3‐
<i>c</i>
]pyrrol Derivatives
作者:Xue Lu、Yili Zhang、Yichen Wang、Yuzhen Chen、Weiwen Chen、Ruoting Zhan、John C.‐G. Zhao、Huicai Huang
DOI:10.1002/adsc.201900254
日期:2019.7.2
A highly enantioselective organocatalytic Michael addition‐acetalation/oxa‐Michael reaction involving aldehydes and dioxopyrrolidines has been discovered. The asymmetric reaction is mediated by modularly designed organocatalysts (MDOs) self‐assembled from cinchona alkaloid derivatives and amino acids providing a range of optically active tricyclic hexahydro‐2H‐pyrano[3′,2′:5,6]pyrano[2,3‐c]pyrrol derivatives
已发现涉及醛和二氧杂吡咯烷的高度对映选择性的有机催化迈克尔加成缩醛/ oxa-Michael反应。不对称反应是由金鸡纳生物碱衍生物和氨基酸自组装而成的模块化设计的有机催化剂(MDO)介导的,提供一系列光学活性的三环六氢-2 H-吡喃[3',2':5,6]吡喃[2,在温和的反应条件下,3- c ]吡咯衍生物的收率高(高达99%),对映选择性很好(至ee高达99%)。