Sequential Electrophilic Trifluoromethanesulfanylation–Cyclization of Tryptamine Derivatives: Synthesis of C(3)-Trifluoromethanesulfanylated Hexahydropyrrolo[2,3-<i>b</i>]indoles
作者:Yi Yang、Xueliang Jiang、Feng-Ling Qing
DOI:10.1021/jo3013385
日期:2012.9.7
A practical and efficient synthesis of C(3)-trifluoromethanesulfanylated hexahydropyrrolo[2,3-b]indoles 5 from tryptamine derivatives was described. The features of this synthesis included electrophilic activation of C(3) of tryptamine derivatives with “CF3S+” and cascade ring cyclization by carbamate nucleophile attacking at C(2). Surprisingly, when Lewis acid (BF3·OEt2) was used as activator instead
实用和有效的合成C(3)-三氟甲烷磺酰化六氢吡咯并[2,3- b ]吲哚5从色胺衍生物。该合成的特征包括对带有“ CF 3 S + ”的色胺胺衍生物的C(3)进行亲电活化,并通过攻击C(2)的氨基甲酸酯亲核试剂实现级联环环化。出乎意料的是,当使用路易斯酸(BF 3 ·OEt 2)代替质子酸(TsOH·H 2 O)进行色胺胺衍生物的亲电子三氟甲烷磺酰化反应时,未环化产物6是优先组建的。此顺序的三氟甲烷磺酰化-环化方案用于合成几种吡咯烷基吲哚类生物碱类似物。评估了这些三氟甲烷磺酰化生物碱类似物对三种癌细胞系(K562,HeLa,L929)的细胞毒性活性。
Enantioselective Radical Cyclization of Tryptamines by Visible Light-Excited Nitroxides
(UV) and visiblelight, and their electron can be excited from the π-bonding orbital to the antibonding π* orbital or the n-bonding orbital to the antibonding π* orbital, respectively. Despite the reported UV-induced hydrogenatom transfer (HAT) process, the potential of nitroxides for visible light-excited photosynthesis is underexplored. Here we demonstrate that nitroxide can convert indole to its
Divergent synthesis of bis(indolyl)methanes <i>via</i> Fe<sup>III</sup>-catalysed regioselective dehydrogenative coupling reactions: a biomimetic approach to 6,6′-bis-(debromo)-gelliusine F
作者:Yan Wu、Mou-De Liu、Qing Wang、Huan Tian、Jin-Bao Fan、Ying-Jun Zhou、Ya-Jing Wang、Xu Deng
DOI:10.1039/d2ob02236b
日期:——
assembly of diverse 2,8′- and N1,8′-bis(indolyl) methane derivatives from readily-available startingmaterials by simply changing the FeIII salt and reaction temperature. Besides, the fast reaction rate, mild reaction conditions, low catalyst cost and easy operations make this methodology quite useful. The synthetic utility was further demonstrated in the biomimetic synthesis of 6,6′-bis-(debromo)-gelliusine
在 DDQ 作为助氧化剂存在下,色胺与无毒 Fe III盐催化的发散脱氢偶联反应得到了发展。值得注意的是,这些转化的特点是通过简单地改变 Fe III盐和反应温度,从容易获得的起始材料中快速、区域选择性地组装多种 2,8'- 和 N1,8'-双(吲哚基)甲烷衍生物。此外,该方法具有反应速率快、反应条件温和、催化剂成本低、操作简单等优点。在 6,6'-双-(debromo)-gelliusine F 的仿生合成中进一步证明了合成效用。
Trifluoromethylthiolation of Tryptophan and Tyrosine Derivatives: A Tool for Enhancing the Local Hydrophobicity of Peptides
of Trp residues in shortpeptides (66–80% yield) and the synthesis of various CF3S-analogues of biologically active monoamines. To prove the concept, Fmoc-(CF3S)Tyr and -Trp were incorporated into the endomorphin-1 chain (EM-1) and into model tripeptides by solid-phasepeptidesynthesis. A remarkable enhancement of the local hydrophobicity of the trifluoromethylthiolated peptides was quantified by the