Asymmetric Synthesis of Tetracyclic Pyrroloindolines and Constrained Tryptamines by a Switchable Cascade Reaction
作者:Corien de Graaff、Lisa Bensch、Sjoerd J. Boersma、Răzvan C. Cioc、Matthijs J. van Lint、Elwin Janssen、Nicholas J. Turner、Romano V. A. Orru、Eelco Ruijter
DOI:10.1002/anie.201507041
日期:2015.11.16
The interrupted Fischer indole synthesis of arylhydrazines and biocatalytically generated chiral bicyclic imines selectively affords either tetracyclic pyrroloindolines or tricyclic tryptamine analogues depending on the reaction conditions. We demonstrate that the reaction is compatible with a variety of functional groups. The products are obtained in high optical purity and in reasonable to good yield
芳基肼的费歇尔吲哚合成中断和生物催化产生的手性双环亚胺选择性地提供四环吡咯并吲哚啉或三环色胺类似物,具体取决于反应条件。我们证明该反应与多种官能团相容。获得的产品具有高的光学纯度,并且具有合理至良好的产率。我们提出了一个合理的反应机理来解释所观察到的反应结果,具体取决于酸介体的化学计量。为了证明我们方法的合成实用性,在高效反应序列中合成了两种产品类别的药物相关实例,包括酚丝氨酸类似物作为潜在的胆碱酯酶抑制剂,而约束性色胺衍生物作为5-HT的选择性抑制剂。6血清素受体和TRPV1离子通道。