Metal-Free-Catalyzed Synthesis of Allyl Nitriles via C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>3</sup></sub> Coupling between Olefins and Azobis (Alkyl-carbonitrile)
The metal-free-catalyzed synthesis of allyl nitriles from Csp2-Csp3 coupling between olefins and azobis was carried out. Key on this work was that the synthesis of allyl nitriles directly using olefin as a starting material was considered to be more efficient and economical than the alkyne, alkynyl carboxylic acid, or cinnamic acid used in previous works. Moreover, in this reaction, iodine served as
Anodic benzylic C(sp<sup>3</sup>)–H amination: unified access to pyrrolidines and piperidines
作者:Sebastian Herold、Daniel Bafaluy、Kilian Muñiz
DOI:10.1039/c8gc01411f
日期:——
important heterocyclic motifs of pyrrolidines and piperidines within a uniform reaction protocol. The mechanism of this unprecedented C–H amination strategy involves anodic C–H activation to generate a benzylic cation, which is efficiently trapped by a nitrogen nucleophile. The applicability of the process is demonstrated for 40 examples comprising both 5- and 6-membered ring formations.
Synthesis of Aryl Ketones or Ketimines by Palladium-Catalyzed Arene C−H Addition to Nitriles
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo060220g
日期:2006.4.1
The unprecedented palladium-catalyzed C−H addition of arenes to nitriles provides moderate to excellent yields of aryl ketones or the corresponding hindered imines. The addition of a small amount of DMSO increases the yields dramatically. Both intermolecular and intramolecular reactions are successful, although the intramolecular reactions tend to be more sluggish. This novel chemistry is believed
Visible-Light-Mediated Remote γ-C(sp<sup>3</sup>)–H Functionalization of Alkylimidates: Synthesis of 4-Iodo-3,4-dihydropyrrole Derivatives
作者:Yogesh Kumar、Yogesh Jaiswal、Amit Kumar
DOI:10.1021/acs.orglett.8b02022
日期:2018.8.17
dihydropyrrole derivatives is reported. The developed protocol proceeds via chemoselective intramolecular N–C bond formation of alkylimidates through 1,5-hydrogen atom transfer from in situ generated imidate N-radicals. The major advantage of this designed strategy lies in the choice of starting materials, mild reaction conditions, high chemo- and diastereoselectivity, clean source of energy, and good functional
Enantioselective Copper(I)/Chiral Phosphoric Acid Catalyzed Intramolecular Amination of Allylic and Benzylic C−H Bonds
作者:Liu Ye、Yu Tian、Xiang Meng、Qiang‐Shuai Gu、Xin‐Yuan Liu
DOI:10.1002/anie.201911742
日期:2020.1.13
radical-involved enantioselective intramolecular C(sp3 )-H amination of not only allylic positions but also benzylic positions with broad substrate scope. The use of 4-methoxy-NHPI (NHPI=N-hydroxyphthalimide) as a stable and chemoselective HAT mediator precursor is crucial for the fulfillment of this transformation. Preliminary mechanistic studies indicate that a crucial allylic or benzylic radical intermediate