Highly Enantioselective Tandem Michael Addition of Tryptamine-Derived Oxindoles to Alkynones: Concise Synthesis of Strychnos Alkaloids
作者:Weigang He、Jiadong Hu、Pengyan Wang、Le Chen、Kai Ji、Siyu Yang、Yin Li、Zhilong Xie、Weiqing Xie
DOI:10.1002/anie.201800567
日期:2018.3.26
to alkynones was developed by taking advantage of a chiral N,N′‐dioxide Sc(OTf)3 catalyst. The reaction enables the facile preparation of enantioenriched spiro[pyrrolidine‐3,3′‐oxindole] compounds, which provides a novel strategy for the synthesis of monoterpenoid indole alkaloids. As a demonstration, the asymmetric synthesis of strychnos alkaloids [(−)‐tubifoline, (−)‐tubifolidine, (−)‐dehydrotubifoline]
利用手性N,N'-二氧化物Sc(OTf)3催化剂,开发了将对乙酰氨基酚类色胺衍生的高对映选择性串联迈克尔加成吲哚。该反应使对映体富集的螺[吡咯烷-3,3'-羟吲哚]化合物的制备变得容易,这为单萜类吲哚生物碱的合成提供了新的策略。作为一个证明,兜兰生物碱[(-)-tubifoline,(-)-tubifolidine,(-)-dehydrotubifoline]的不对称合成在10-11个步骤中完成。