Metal-free late-stage C(sp<sup>2</sup>)–H functionalization of<i>N</i>-aryl amines with various sodium salts
作者:Chandrashekar Mudithanapelli、Mi-hyun Kim
DOI:10.1039/c9ob02217a
日期:——
Metal-free consecutive C(sp2)–X (X = Cl, Br, S, N) bond formations of N-aryl amines (cyclic, fused, carbamate, and aminium radicals) were achieved under mild conditions using [bis(trifluoroacetoxy)iodo]benzene (PIFA) and simple nonharmful sodium salts. This direct and selective C(sp2)–H functionalization showed excellent functional group compatibility, cost effectiveness, and late-stage applicability
不含金属的连续的C(SP 2)-X(X =氯,溴,S,N)的键形成ñ -芳基胺(环状,稠合,氨基甲酸酯,和铵基团)使用[双温和的条件下实现(三氟乙酰氧基)碘]苯(PIFA)和简单的无害钠盐。这种直接和选择性的C(SP 2)–H官能化显示出优异的官能团相容性,成本效益和生物活性天然产物合成的后期适用性。提出了两种机制来解释邻位或对位偏爱以及CH 3 NO 2的加速作用。
Direct sp<sup>3</sup>CH Amination of Nitrogen-Containing Benzoheterocycles Mediated by Visible-Light-Photoredox Catalysts
Visible‐light‐mediateddirect sp3 CHamination of benzocyclic amines via α‐aminoalkyl radicals by using photoredox catalysts is described here. The obtained N,N‐acetals were also successfully applied for carbon–carbon bond forming reactions with carbon nucleophiles. The procedure is suitable for a late‐stage modification of CH bonds to CC bonds.
We report a high yielding approach to N-aryl tetrahydroisoquinolines and tetrahydroquinolines in one step from readily available starting materials. We have used this methodology to prepare the full carbon skeleton of the ring system of ancistrocladinium A in one step.
我们报告了一种利用现成的起始材料一步制备 N-芳基四氢异喹啉和四氢喹啉的高产方法。我们利用这种方法一步制备了安基斯特拉地宁 A 环系统的全部碳骨架。
A FACILE ROUTE FOR THE PREPARATION OF N-PHENYL TETRAHYDROQUINOLINES AND TETRAHYDROISOQUINOLINES
A convenient N-arylation of tetrahydroquinoline and tetrahydroisoquinoline is described using electron-poor, electron-neutral, or electron-rich arylhalide derivatives and palladium(II)-BINAP as a catalyst.
A boronic acidcatalyzed one-pot reduction of quinolines with Hantzsch ester followed by N-arylation via external base-free Chan–Evans–Lam coupling has been demonstrated. This step-economical synthesis of N-aryl tetrahydroquinolines has been accomplished from readily available quinoline, Hantzsch ester, and arylboronicacid under mild reaction conditions. The dual role of boronic acid as a catalyst