在已知的化合物2-(苯并恶唑-2'-基)-3-二甲基氨基丙烯醛中,邻乙酰氨基酚(2)与Vilsmeier试剂在Meth-Cohn条件下反应生成2-甲酰基吡啶并[2,1- b ]苯并恶唑(5) (4)。在乙酸酐中回流4得到4-甲酰基吡啶并[2,1- b ]苯并恶唑(6),其为5的异构体。两个图5a和6a中进行了结构表征通过X射线晶体学。5的形成机理 提出了包括顺序氯化,二聚化,分子内去除HCl形成恶唑环,两次甲酰化以及区域选择性分子内亲核环化以构建吡啶酮环的方法。
在已知的化合物2-(苯并恶唑-2'-基)-3-二甲基氨基丙烯醛中,邻乙酰氨基酚(2)与Vilsmeier试剂在Meth-Cohn条件下反应生成2-甲酰基吡啶并[2,1- b ]苯并恶唑(5) (4)。在乙酸酐中回流4得到4-甲酰基吡啶并[2,1- b ]苯并恶唑(6),其为5的异构体。两个图5a和6a中进行了结构表征通过X射线晶体学。5的形成机理 提出了包括顺序氯化,二聚化,分子内去除HCl形成恶唑环,两次甲酰化以及区域选择性分子内亲核环化以构建吡啶酮环的方法。
Antimalarial Benzimidazole Derivatives Incorporating Phenolic Mannich Base Side Chains Inhibit Microtubule and Hemozoin Formation: Structure–Activity Relationship and <i>In Vivo</i> Oral Efficacy Studies
作者:Godwin Akpeko Dziwornu、Dina Coertzen、Meta Leshabane、Constance M. Korkor、Cleavon K. Cloete、Mathew Njoroge、Liezl Gibhard、Nina Lawrence、Janette Reader、Mariëtte van der Watt、Sergio Wittlin、Lyn-Marie Birkholtz、Kelly Chibale
DOI:10.1021/acs.jmedchem.1c00354
日期:2021.4.22
A novel series of antimalarial benzimidazole derivatives incorporating phenolic Mannich base side chains at the C2 position, which possess dual asexual blood and sexual stage activities, is presented. Structure–activityrelationshipstudies revealed that the 1-benzylbenzimidazole analogues possessed submicromolar asexual blood and sexual stage activities in contrast to the 1H-benzimidazole analogues
Radical Carbonylation Mediated by Continuous-Flow Visible-Light Photocatalysis: Access to 2,3-Dihydrobenzofurans
作者:Nenad Micic、Anastasios Polyzos
DOI:10.1021/acs.orglett.8b01971
日期:2018.8.3
The annulative carbonylation of alkenyl-tethered arenediazonium salts using visible-light photocatalysis in continuous flow is described. The method furnishes a diverse series of novel acetate-functionalized 2,3-dihydrobenzofurans at room temperature and moderate CO pressure (25 atm), delivering these products in a short time with straightforward scale-up. This continuous flow and free-radical approach
Metal-free direct annulation of 2-aminophenols and 2-aminothiophenols with unactivated amides through transamidation: Access to polysubstituted benzoxazole and benzothiazole derivatives
hydrochloride played a crucial role in amide activation followed nucleophilic attack that through eliminations of amine as a side product, and de-hydrolysis step leads to final annulation. This versatile strategy is applicable to a wide variety of differently substituted o-aminophenols, unactivated aliphatic and aromatic amides, yielding the corresponding product in good to excellent yields in a single step
申请人:Max-Planck-Gesellschaft zur Förderung der
Wissenschaften e.V.
公开号:EP3628664A1
公开(公告)日:2020-04-01
The present invention relates to novel substituted 2-halopyrimidines and 5-halopyrazines, as well as pharmaceutical compositions containing at least one of these substituted 2-halopyrimidines or 5-halopyrazines together with at least one pharmaceutically acceptable carrier, excipient and/or diluent. Said substituted 2-halopyrimidines and 5-halopyrazines are covalently binding to KRas mutant G12C and therefore, are useful for the prophylaxis and treatment of cancer by direct inhibition of the KRas G12C-oncogenic signaling in cells.
Neutral Anion Receptors: Synthesis and Evaluation as Sensing Molecules in Chemically Modified Field Effect Transistors
作者:Martijn M. G. Antonisse、Bianca H. M. Snellink-Ruël、Isteyfo Yigit、Johan F. J. Engbersen、David N. Reinhoudt
DOI:10.1021/jo9707040
日期:1997.12.1
A new class of anion selective receptors is based on the neutral uranylsalophene building block as Lewis acidic binding site. Additional hydrogen bond accepting or donating moieties near the anion binding site offer the possibility of varying the binding selectivity. Field effect transistors chemically modified with such receptors exhibit anion selectivities that strongly deviate from the classical Hofmeister series favoring phosphate or fluoride anions, depending on the structure of the uranylsalophenes. The phosphate selective chemically modified field effect transistors (CHEMFETs) detect phosphate with high selectivity over much more lipophilic anions, such as nitrate (log K-H2PO4,NO3(Pot) = -1.3), at [H2PO4-] greater than or equal to 6.3 x 10(-4) M. CHEMFETs modified with salophenes with amido substituents result in a high fluoride selectivity; even in the presence of 0.1 M chloride, fluoride can be detected at [F-] greater than or equal to 6 x 10(-4) M (log K-F,Cl(Pot) = -2.0).