疟疾仍然是最致命的传染病之一,每年导致成千上万的死亡,主要是在幼儿和孕妇中。在这里,我们报道了针对恶性疟原虫(疟疾最致命的物种)的一系列吡唑并[3,4- b ]吡啶的发现和衍生化。该系列中的命中化合物在体外显示出亚微摩尔对寄生虫的红细胞内阶段具有高活性,对人成纤维细胞BJ和肝HepG2细胞系几乎没有毒性。此外,我们的命中化合物对寄生虫的肝期表现出良好的活性,但对配子体阶段的活性却很小。包括杀死率,对接率和分子动力学研究在内的寄生虫学资料表明,我们的化合物可能靶向细胞色素bc 1的Q o结合位点。
2-Trifluoromethylated furans and dihydrofuranols were tunably synthesized from the cyclization of β-ketonitriles with 3-bromo-1,1,1-trifluoroacetone mediated by bases. In addition, dehydration of dihydrofuranol compounds with concentratedsulfuricacid gave another 2-(trifluoromethyl)furans isomer. The developed methodology exhibits an excellent functional group tolerance for both aromatic and aliphatic β-ketonitriles
Selective Synthesis of β-Ketonitriles via Catalytic Carbopalladation of Dinitriles
作者:Ge Zeng、Jichao Liu、Yinlin Shao、Fangjun Zhang、Zhongyan Chen、Ningning Lv、Jiuxi Chen、Renhao Li
DOI:10.1021/acs.joc.0c02388
日期:2021.1.1
A practical, convenient, and highly selective method of synthesizing β-ketonitriles from the Pd-catalyzed addition of organoboron reagents to dinitriles has been developed. This method provides excellent functional-group tolerance, a broad scope of substrates, and the convenience of using commercially available substrates. The method is expected to show further utility in future synthetic procedures
Tertiary amine-catalyzed (3+3) annulations of δ-acetoxy allenoates: Substrate scope, synthetic application and mechanistic insight
作者:Chunjie Ni、Weiping Zhou、Xiaofeng Tong
DOI:10.1016/j.tet.2017.04.058
日期:2017.6
highly stereoselective synthesis of the core of calyxin I. Mechanistic experiments suggest the involvement of 3-ammonium-2,4-dienoate intermediate BN. This type of cationic intermediate arises from an addition-elimination process between allenoate substrate and amine catalyst, and is stable enough for isolation and characterization. Mechanistic studies also disclose the crucial role of amide NH of 5g
An efficient iodine-mediated cascade synthesis of 3-aza-bicyclo[3.1.0]hex-2-ene derivatives from easily prepared N-allyl enamines has been developed. The advantages of the reaction include facilitative preparation of substrates 3a–t, good functional group tolerance and transition-metal-free conditions.