A cascade iridium-catalysed oxindolesynthesis was achieved using pyridyl-protected anilines and bis(2,2,2-trifluoroethyl) 2-diazomalonate. The developed protocol is simple and scalable, and has a broad scope and excellent regioselectivity. The pyridyl directing group can easily be removed. The method was further extended to give C-7-functionalized oxindole derivatives in a straightforward manner.
Ruthenium-Catalyzed Remote C–H Sulfonylation of <i>N</i>-Aryl-2-aminopyridines with Aromatic Sulfonyl Chlorides
作者:Balu Ramesh、Masilamani Jeganmohan
DOI:10.1021/acs.orglett.7b03051
日期:2017.11.3
A ruthenium-catalyzedremote sulfonylation at the C5 position of the pyridine group of N-aryl-2-aminopyridines with aromatic sulfonyl chlorides is described. The mechanistic and deuterium labeling studies clearly reveal that the ruthenametallacycle is a key intermediate in the reaction, which forms via the C–H bond activation. The DFT calculation supports that the C5 position of the 2-aminopyridine
Synthesis of 11C-amides using [11C]carbon monoxide and in situ activated amines by palladium-mediated carboxaminations
作者:Farhad Karimi、Bengt Långström
DOI:10.1039/b209553j
日期:2003.1.30
were used in the palladium-mediatedsynthesis of twenty 11C-amides. In the study several approaches to improve the radiochemical yield were explored. Eight of the selected amides were prepared by in situ activation of the amines usinglithium bis(trimethylsilyl)amide and the radiochemical yields of these reactions were improved compared to utilising a previous reported method. In the synthesis of 1
Rhodium(III)-catalyzed intermolecular cyclization of anilines with sulfoxonium ylides toward indoles
作者:Zhihao Shen、Chao Pi、Xiuling Cui、Yangjie Wu
DOI:10.1016/j.cclet.2019.01.033
日期:2019.7
Abstract Rhodium(III)-catalyzed synthesis of indole derivatives has been realized via cascade reaction of C H alkylation/nucleophilic cyclization starting from readily available N-phenylpyridin-2-amines and sulfoxonium ylides. Notably, this transformation could smoothly proceed with high yields, good regioselectivity, and feature broad group tolerance and under redox-neutral condition to avoid external
A new one‐potsynthesis of 9‐(pyridin‐2‐yl)‐9H‐carbazoles through the simultaneous CH activation and palladium(II)‐catalyzed cross‐coupling of N‐phenylpyridin‐2‐amines with potassium aryltrifluoroborates is presented. Silver acetate and 1,4‐dioxane proved to be the best oxidant and solvent, respectively. The product yields fluctuated from modest to excellent and the reaction showed sufficient functional
通过同时的CH活化和钯(II)催化的N-苯基吡啶-2-胺与芳基三氟硼酸钾的交叉偶联,新的一锅合成9-(吡啶-2-基)-9 H-咔唑的方法是提出了。醋酸银和1,4-二恶烷分别被证明是最好的氧化剂和溶剂。产物收率从适中波动至优异,反应显示出足够的官能团耐受性。对苯醌是催化过程中金属转移和还原消除步骤的重要配体。第一和第二次CH活化/ C的动力学同位素效应(k H / k D)。 C或C ñ形成步骤测量为分别2.14和1.18,。最后,基于所有实验证据提出了合理的催化机理。