heterocycles has been realized via C(sp3)‐centered radical C(sp2)−C(sp3) bond formation under oxidant‐free conditions at room temperature. This reaction readily incorporates various functional alkyl groups into heterocyclic compounds without observation of any alkyl radicalrearrangement and represents a mild and general tool for the preparation of valuable alkyl group‐functionalized heterocyclic compounds.
Visible-light-driven copper-catalyzed aerobic oxidative cascade cyclization of <i>N</i>-tosylhydrazones and terminal alkynes: regioselective synthesis of 3-arylcoumarins
first example of sustainable, intuitive, highly regioselective, visible-light-driven copper catalyzed aerobic oxidative cascade cyclization of N-tosylhydrazones with terminal alkynes for the preparation of 3-arylcoumarins at room temperature. This operationally simple methodology has been successfully applied to a wide range of N-tosylhydrazones and alkynes (49 examples), and proceeds well to afford biologically
我们提出了可持续的,直观的,高度区域选择性的,可见光驱动的铜催化的N-甲苯磺酰with与末端炔烃的有氧氧化级联环化反应,以在室温下制备3-芳基香豆素。这种操作简单的方法已成功应用于各种N-甲苯磺酰hydr和炔烃(49个实例),并且进展顺利,可提供具有生物活性的化合物,例如单胺氧化酶B(MAO-B)抑制剂和辣根过氧化物酶(HRP)抑制剂,在温和的条件下具有令人满意的产量。此外,机理研究表明,反应是通过铜进行的(II18 O 2同位素标记实验证明)-超氧或-过氧配合物介导的末端炔烃的氧化环化反应。
MEROCYANINE-BASED COMPOUNDS, AND DYES, KITS AND CONTRAST MEDIUM COMPOSITIONS FOR LABELLING BIOMOLECULES COMPRISING THE SAME
申请人:SFC CO., LTD.
公开号:US20170306155A1
公开(公告)日:2017-10-26
The present disclosure relates to a novel merocyanine-based compound capable of labeling biomolecules by intercalating biomolecules, and to a dye, kit and contrast medium composition for labelling biomolecules comprising the same.
Direct β-C(sp<sup>3</sup>)–H Functionalization of Aliphatic Amines to α,β-Unsaturated Imines, Aldehydes, and Chromenes
作者:Sumana Mandal、Sujit Mahato、Chandan K. Jana
DOI:10.1021/acs.orglett.5b01744
日期:2015.8.7
functionalization of aliphatic amine was developed. The method is based on a reaction that yields enamine directly from the corresponding aliphatic amine, which otherwise requires the aid of metallic reagent and/or external oxidant. The reaction is operationally simple, general, and highly efficient in functionalizing both cyclic and acyclic amines. Structurally diverse unsaturated imines were obtained from N-heterocycles
We present herein the first visible-light-driven hydrocarboxylation as well as carbocarboxylation of alkynes using CO2 via an iridium/cobalt dual catalysis. Such transformations provide access to various pharmaceutically important heterocycles in a one-pot procedure from readily available alkynes. Coumarins, 2-quinolones, and 2-benzoxepinones were directly accessed through a one-pot alkyne hydrocarboxylation/alkene
我们在此展示了第一个可见光驱动的烃羧化以及通过铱/钴双催化使用 CO2 的炔烃的羧化。这种转化提供了通过一锅法从容易获得的炔烃获得各种药学上重要的杂环的途径。通过一锅炔烃加氢羧化/烯烃异构化/环化序列直接获得香豆素、2-喹诺酮和 2-苯并氧杂环酮,其中 Ir 光催化剂起到双重作用,促进炔烃加氢羧化中的单电子转移和随后的能量转移烯烃异构化。此外,前所未有的钴羧化/酰基迁移级联使炔双官能化能够高效引入γ-羟基丁烯内酯。