Enantioselective Syntheses of
<i>Strychnos</i>
and
<i>Chelidonium</i>
Alkaloids through Regio‐ and Stereocontrolled Cooperative Catalysis
作者:Luke S. Hutchings‐Goetz、Chao Yang、James W. B. Fyfe、Thomas N. Snaddon
DOI:10.1002/anie.202005151
日期:2020.9.28
We describe enantioselective syntheses of strychnos and chelidonium alkaloids. In the first case, indole acetic acid esters were established as excellent partner nucleophiles for enantioselective cooperative isothiourea/Pd catalyzed α‐alkylation. This provides products containing indole‐bearing stereocenters in high yield and with excellent levels of enantioinduction in a manner that is notably independent
我们描述的对映选择性合成马钱子和白屈菜生物碱。在第一种情况下,吲哚乙酸酯被确定为对映选择性协同异硫脲/ Pd催化α-烷基化的优秀伴侣亲核试剂。这提供了以高收率和出色的对映体诱导水平包含吲哚的立构中心的产品,其方式明显独立于N取代基。这导致了(−)‐ akuammicine和(−)‐ strychnine的简明合成。在第二种情况下,邻位表现不佳对映选择性协同异硫脲/ Ir催化的α-烷基化反应中的预取代肉桂酸亲电试剂可通过适当的取代基选择来克服,从而导致(+)-螯合碱,(+)-去甲螯合碱和(+)-螯合胺的对映选择性合成。