Synthesis of pyrroloindolines and furoindolines via cascade dearomatization of indole derivatives with carbenium ion
作者:Chuan Liu、Qin Yin、Li-Xin Dai、Shu-Li You
DOI:10.1039/c5cc00780a
日期:——
Intermolecular cascade dearomatization of substituted indoles with benzodithiolylium tetrafluoroborate has been developed, providing C3 methyl-substituted pyrroloindolines and furoindolines.
The asymmetric catalytic synthesis of 3-cyclotryptamine substituted oxindoles through formal [4 + 2] cycloaddition/cyclization cascade is described. A wide range of cyclotryptamine derivatives were obtained in enantioenriched form under mild reaction conditions and were found to have potential anticancer activity. The strategy enables ready assembly of cyclotryptamine subunits at the C3a–C3a′ positions
描述了通过正式的[4 + 2]环加成/环化级联反应3-环色胺取代的羟吲哚的不对称催化合成。在温和的反应条件下,以对映体富集的形式获得了广泛的环色胺衍生物,发现它们具有潜在的抗癌活性。该策略使C 3a – C 3a'位置的环色胺亚基易于组装,并具有两个四级立体异构中心,具有顺式选择性,从而可以合成光学活性的顺式双(六氢吡咯并吲哚)和环色胺生物碱家族的其他化合物。
Enantioselective Synthesis of 3a-Amino-Pyrroloindolines by Copper-Catalyzed Direct Asymmetric Dearomative Amination of Tryptamines
作者:Chuan Liu、Ji-Cheng Yi、Zhong-Bo Zheng、Yong Tang、Li-Xin Dai、Shu-Li You
DOI:10.1002/anie.201508570
日期:2016.1.11
A directasymmetricdearomativeamination of tryptamines with O‐(2,4‐dinitrophenyl)hydroxylamine (DPH) was achieved using CuBr‐bisoxazoline complex as a catalyst, affording 3a‐amino‐pyrroloindolines in good to excellent enantioselectivity under mild reaction conditions. Furthermore, the synthetic value of this method was demonstrated in the total synthesis of (−)‐psychotriasine in a highly concise
C 2-Symmetric Chiral Sulfoxide-Mediated Intermolecular Interrupted Pummerer Reaction for Enantioselective Construction of C3a-Substituted Pyrroloindolines
The first example of an enantioselective intermolecular interrupted Pummerer reaction has been developed by the utilization of a C 2-symmetric chiral sulfoxide. The reaction was used for the enantioselective synthesis of C3a-substituted pyrroloindolines in a one-pot procedure starting from tryptamine. The synthetic utility of the reaction was further demonstrated by its application to the highly concise