PhIO/Et<sub>3</sub>N ⋅ 3HF-Mediated Formation of Fluorinated 2<i>H</i>-Azirines via Domino Fluorination/Azirination Reaction of Enamines
作者:Yong Zhang、Xiaoyuan Zhao、Chen Zhuang、Senlin Wang、Daisy Zhang-Negrerie、Yunfei Du
DOI:10.1002/adsc.201800124
日期:2018.6.5
enaminones were converted to the biologically interesting fluorinated 2H‐azirines through reactions with PhIF2 generated in situ by PhIO and Et3N ⋅ 3HF in 1,2‐dichroloethane, which features the hypervalent iodine reagents‐mediated introduction of fluorine atom and formation of the 2H‐azirine skeleton under metal‐free conditions. The domino reaction is postulated to proceed via a PhIF2‐mediated oxidative
<i>in</i>
<i>situ</i>
Formation of RSCl/ArSeCl and Their Oxidative Coupling with Enaminone Derivatives Under Transition‐metal Free Conditions
作者:Zhenhua Shang、Qingyu Chen、Linlin Xing、Yilin Zhang、Laura Wait、Yunfei Du
DOI:10.1002/adsc.201900940
日期:2019.11.5
The reaction of diorganyl disulfides or diselenides with PhICl2 in DMF at room temperature led to the in situ formation of the reactive organosulfenyl chloride (RSCl) or selenenyl chloride (ArSeCl), which reacted with enaminone compounds to afford a series of α‐thioenaminones or α‐selenylenaminones, respectively, including the bioactive inhibitor for Cdc25B and its analogue, via the intermolecular
arylboronic acids and ester (Z)-3-aminoacrylates, one-pot syntheses of diverse indole-3-carboxylic esters have been described through copper(II)-catalyzed sequential Chan–Lam N-arylation and cross-dehydrogenativecoupling (CDC) reactions. The initial Chan–Lam arylation can proceed in DMF at 100 °C for 24 h to give ester (Z)-3-(arylamino)acrylate intermediates in the presence of Cu(OAc)2/tri-tert-butylphosphine
从芳基硼酸和酯 ( Z )-3-氨基丙烯酸酯开始,通过铜 ( II ) 催化的顺序 Chan-Lam N-芳基化和交叉脱氢偶联 (CDC )描述了多种吲哚-3-羧酸酯的一锅合成。) 反应。最初的 Chan-Lam 芳基化可以在 DMF 中在 100 °C 下进行 24 小时,在 Cu(OAc) 2 /三叔丁基膦四氟硼酸催化剂存在下得到酯 ( Z )-3-(芳氨基)丙烯酸酯中间体。作为添加剂的肉豆蔻酸、KMnO 4和KHCO 3的量。依次,这些就地芳基化中间体可以在混合溶剂(DMF/DMSO = 2:1)中在 130 °C 下进行分子内氧化交叉脱氢偶联过程,得到 C3 官能化多取代吲哚衍生物。
A variety of enaminones and enamine carboxylic esters were converted to trifluoroethoxylated 2H-azirines through reactions with PhIO in trifluoroethanol (TFE). The cascade reaction is postulated to proceed via a PhIO-mediated oxidative trifluoroethoxylation and a subsequent azirination of the alpha-trifluoroethoxylated enamine intermediates.