我们合成了一系列新颖的4,9-二氧代-4,9-二氢-1 H-萘[2,3- d ] [1,2,3]三唑-3-鎓盐,可以将其视为类似物阳离子蒽醌。与我们之前报道的类似类似物不同,这些化合物显示出相对较弱的抗菌活性,但发挥了很强的抗癌活性(从低至μM到nM GI 50),尤其是针对黑色素瘤,结肠癌,非小细胞肺癌和中枢神经系统(CNS)癌症的治疗。这些化合物在结构上不同于其前身,因为它们具有直接连接到阳离子蒽醌骨架上的芳基而不是烷基链。对结构-活性关系(SAR)的进一步研究表明,芳环上的给电子取代基在通过共振效应增强抗癌活性方面具有重要作用。这些基团的立体位阻是不利的,但其影响不如共振效应。阳离子蒽醌类似物在N-1位的连接基团的差异是生物活性从抗菌药向抗癌药转换的主要结构因素。
An efficient method for the reduction of aromatic azides to anilines via the Staudinger reaction using tri-n-butylphosphonium tetrafluoroborate with triethylamine in aqueous tetrahydrofuran solution is reported. The method enables the aromatic azido-selective reduction of 3-azido-5-(azidomethyl)benzene derivatives to efficiently afford anilines bearing an azidomethyl group.
Regioselective Conversion of Arenes to<i>N</i>-aryl-1,2,3-triazoles Using CH Borylation
作者:Rajavel Srinivasan、Anthony G. Coyne、Chris Abell
DOI:10.1002/chem.201403021
日期:2014.9.8
A one‐pot protocol for the synthesis of N‐aryl 1,2,3‐triazoles from arenes by an iridium‐catalyzed CH borylation/copper catalyzed azidation/click sequence is described. 1 mol % of Cu(OTf)2 was found to efficiently catalyze both the azidation and the click reaction. The applicability of this method is demonstrated by the late‐stage chemoselective installation of 1,2,3‐triazole moiety into unactivated
A method for protecting organic azides from click reactions with alkynes is reported. Treatment of azides with Amphos affords phosphazides, which are stable under click reaction conditions and are easily converted back to azides by treatment with elemental sulfur. Thus, the method allows for facile modification of azide compounds via site-selective click reactions.
Ferrous Sulfide/Aqueous Ammonia: Simple, Efficient, and Chemoselective Reagent for the Conversion of Aromatic Azide to Amine
作者:Amol V. Gadakh、Bhausaheb K. Karale
DOI:10.1080/00397910701739097
日期:2008.1
Abstract A practical, environmentally benign, rapid, and efficient method for the reduction of aromaticazide to amine is described using FeS/aqueous ammonia in the presence of other reducible functionalities. Application of a novel reducing reagent results in aromaticamines with excellent yield and high chemoselectivity, without need of any purification techniques.
Metal‐Free Synthesis of Functional 1‐Substituted‐1,2,3‐Triazoles from Ethenesulfonyl Fluoride and Organic Azides
作者:Marie‐Claire Giel、Christopher J. Smedley、Emily R. R. Mackie、Taijie Guo、Jiajia Dong、Tatiana P. Soares da Costa、John E. Moses
DOI:10.1002/anie.201912728
日期:2020.1.13
scalable click-inspired protocol for the synthesis of 1-substituted-1,2,3-triazoles from organicazides and the bench stable acetylene surrogate ethenesulfonyl fluoride (ESF). The new transformation tolerates a wide selection of substrates and proceeds smoothly under metal-free conditions to give the products in excellent yield. Under controlled acidic conditions, the 1-substituted-1,2,3-triazole products