Mn(OAc)<sub>3</sub>-Mediated Hydrotrifluoromethylation of Unactivated Alkenes Using CF<sub>3</sub>SO<sub>2</sub>Na as the Trifluoromethyl Source
作者:Bin Cui、Hui Sun、Yibo Xu、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1021/acs.joc.8b00633
日期:2018.6.1
A simple and efficient method for hydrotrifluoromethylation of unactivated alkenes was reported. The reaction relied on the single electron oxidation of a commercially available sodiumtrifluoromethanesulfinate (CF3SO2Na, Langlois’ reagent) using Mn(OAc)3·2H2O as the oxidant and the subsequent addition of trifluoromethyl radical to C═C double bonds. The reaction proceeded readily under mild conditions
报道了一种简单有效的未活化烯烃加氢三氟甲基化的方法。该反应依赖于使用Mn(OAc)3 ·2H 2 O作为氧化剂的市售三氟甲烷亚磺酸钠(CF 3 SO 2 Na,Langlois试剂)的单电子氧化,随后将三氟甲基自由基加到C═Cdouble债券。反应在温和条件下容易进行,并且对底物中的各种官能团具有良好的耐受性。通过氘化,自由基钟和TEMPO抑制实验研究了初步反应机理。
Cobalt-catalyzed alkene hydrogenation by reductive turnover
作者:Vincent van der Puyl、Ruairi O. McCourt、Ryan A. Shenvi
DOI:10.1016/j.tetlet.2021.153047
日期:2021.5
reactivity for a given metal center result from ligand field strength, which can promote reaction through either open- or closed-shell carbon intermediates. Herein we report a simple protocol for cobalt-catalyzed alkene reduction. Instead of using an oxidative turnover mechanism that requires stoichiometric hydride, we find a reductive turnover mechanism that requires stoichiometric proton. The reaction
Hypervalent Iodine-Mediated Alkene Functionalization: Oxazoline and Thiazoline Synthesis via Inter-/Intramolecular Aminohydroxylation and Thioamination
A metal‐free oxidative difunctionalization of N‐allylamides and N‐allylthioamides has been developed. This system features the use of a hypervalent iodine oxidant with electron‐deficient amines to access 5‐amino‐oxazoline and thiazoline scaffolds under mild conditions. Notably, various electron‐deficient amines were systematically evaluated and we verified the reaction profile was originated from an
<i>Exo-trig</i> selenocyclization of secondary allylic carboxamides using Woollins’ reagent: <i>en route</i> to 2,5-disubstituted selenazolines
作者:Priyanka N. Makhal、Srinivas Reddy Dannarm、Arbaz Sujat Shaikh、Rezwan Ahmed、Shrilekha Chilvery、Lahu N. Dayare、Rajesh Sonti、Chandraiah Godugu、Venkata Rao Kaki
DOI:10.1039/d2cc06782j
日期:——
We report microwave-assisted selenation and exo-trig cyclization of secondary allylic carboxamides using Woollins’ reagent, a serendipitous finding observed during an attempt to synthesize N-allylbenzoselenoamide compounds. This resulted in the first reported synthesis of 2-aryl-5-methyl selenazolines. Twenty-one diversified selenazolines and three late-stage-functionalized drug molecules were synthesized
Herein, a novel reagent system using CuI/TBHP is described for the facile conversion of easily accessible N-allylarylamides into 5-iodomethyl-2-aryl-4,5-dihydrooxazoles in moderate to good yields. In this communication we describe CuI as the iodine source for the first time towards the intramolecular iodooxygenation of N-allylarylamides.