noncovalent attractive interactions through fine-tuning of the remote substituents of the D2-symmetric chiral amidoporphyrin ligand. This noncovalent interaction strategy presents a solution that may be generally applicable in controlling reactivity and enantioselectivity in intermolecularradical reactions. The Co(II)-catalyzed intermolecular C-H amination, which operates under mild conditions with the C-H
Amination of Diazocarbonyl Compounds: N–H Insertion under Metal-Free Conditions
作者:Xuesong Luo、Gui Chen、Lin He、Xueliang Huang
DOI:10.1021/acs.joc.6b00233
日期:2016.4.1
Transition-metal-free intermolecular N–H insertion of α-diazocarbonyl compounds is reported. Among the series of nitrogen sources examined, dibenzenesulfonimide was found to be the choice in terms of the yields and the reaction time. Primary mechanistic experiments suggest that a pathway involving a sequence of protonation and nucleophilic substitution was preferred.
Visible-light-promoted selective <i>O</i>-alkylation of 2-pyridones with α-aryldiazoacetates
作者:Jingya Yang、Ganggang Wang、Hongyan Zhou、Zhifeng Li、Ben Ma、Menghui Song、Rongxia Sun、Congde Huo
DOI:10.1039/d0ob02350g
日期:——
A visible-light-promoted O–H insertion reaction between 2-pyridones and α-aryldiazoacetates has been developed. Upon visible light irradiation, the reaction proceeds smoothly under mild and catalyst-free conditions. A wide scope of 2-pyridones and α-aryldiazoacetates are well tolerated, and various O-alkylated 2-pyridones are obtained with perfect selectivity and good functional group tolerance. A
the “undirected” strategy for C−H bond functionalization represents a more flexible but more challenging approach. Reported herein is a gold‐catalyzed highly site‐selective C(sp2)−H alkylation of unactivated arenes with 2,2,2‐trifluoroethyl α‐aryl‐α‐diazoesters. This protocol demonstrates that high site‐selective C−H bond functionalization can be achieved without the assistance of a directing group