合成了三个系列的吡咯并与呋喃融合的7-脱氮嘌呤核糖核苷,并筛选了其抑制细胞生长和抗病毒活性。合成基于杂芳基-叠氮基嘧啶的杂环化反应形成三环杂环碱基,然后通过交叉偶联反应或亲核取代进行糖基化和最终衍生。发现吡咯并[2',3':4,5]吡咯并[2,3- d ]嘧啶和呋喃[2',3':4,5]吡咯并[2,3- d ]嘧啶核糖核苷是有效的细胞抑制剂,而同位吡咯并[3',2',4,5]吡咯并[2,3- d]嘧啶核苷是无活性的。最具活性的是甲基,甲氧基和甲基硫烷基衍生物,发挥亚微摩尔的细胞抑制作用,并对癌细胞具有良好的选择性。我们已经表明,核苷被细胞内磷酸化激活,并且核苷酸被掺入RNA和DNA中,从而引起DNA损伤。它们代表了抗肿瘤药物临床前开发的一种新的有希望的候选者。
[EN] C(SP3)-C(SP2) CROSS-COUPLING REACTION OF ORGANOZINC REAGENTS AND HETEROCYCLIC (PSEUDO)HALIDES<br/>[FR] RÉACTION DE COUPLAGE CROISÉ C(SP3)-C(SP2) DE RÉACTIFS D'ORGANOZINC ET DE (PSEUDO)HALOGÉNURES HÉTÉROCYCLIQUES
申请人:UNIV HONG KONG SCI & TECH
公开号:WO2018019291A1
公开(公告)日:2018-02-01
Provided is a method of synthesizing a C(sp3)-C(sp2) cross-coupled compound comprising reacting a C(sp3) coupling partner with a C(sp2) coupling partner, a catalyst, and a solvent; wherein the C(sp3) coupling partner comprises an organic zinc reagent; and wherein the C(sp2) coupling partner comprises a heterocyclic halide or a heterocyclic pseudo halide. The method further comprises synthesis of the organic zinc reagent, wherein the synthesis comprises reacting a zinc powder with an acid, filtering, washing, and drying to obtain an activated zinc powder; and reacting the activated zinc powder with a metal iodide catalyst and a second solvent and heating for a predetermined time to obtain the organic zinc reagent.
A simple and efficient palladium-catalyzed three-component domino reaction of bromothiophenes with internal alkynes has been developed to produce benzo[b]thiophenes in moderate to good yields.
已开发出一种简单高效的溴噻吩与内部炔烃的钯催化三组分多米诺反应,以中等至良好的产率生产苯并[ b ]噻吩。
Compounds comprising 4-benzoylpiperidine as a Sigma-1-selective ligand
申请人:Tu Zhude
公开号:US20110311447A1
公开(公告)日:2011-12-22
Bipiperidinyl compounds and salts thereof are disclosed. The compounds include high affinity ligands for σ
1
receptors. Some compounds are also highly selective for σ
1
receptor compared to σ
2
receptor. Compounds can comprise radioisotopes, including
18
F or
11
C. Radiolabeled compounds can be used as probes for imaging distribution of σ
1
receptor in a subject such as a human using positron emission tomography (PET) scanning.
Redox‐Neutral Vicinal Difunctionalization of Five‐Membered Heteroarenes with Dual Electrophiles
作者:Renhe Li、Guangbin Dong
DOI:10.1002/anie.202110971
日期:2021.12.6
A new reaction mode of palladium/norbornene (Pd/NBE) cooperative catalysis is reported involving the selective coupling of two different carbon-based electrophiles for vicinal double C-H functionalization of five-membered heteroarenes in a site-selective and redox-neutral manner. The key is to use alkynyl bromides as the second electrophile, which allows vicinal difunctionalization of a wide range
Synthesis of 2- and 3-Substituted N-Methylpyrroles
作者:Elena Dvornikova、Krystyna Kamieńska-Trela
DOI:10.1055/s-2002-32578
日期:——
A reliable method of synthesis of 3-bromo-N-methylpyrrole by the use of N-bromosuccinimide and a catalytic amount of PBr 3 is reported. The method described opens a facile route to a variety of 3-substituted pyrroles, which are otherwise difficult to access. In addition, conditions under which pure 2-bromo-N-methylpyrrole can be obtained have been established.