N-Heterocyclic-Carbene-Catalyzed C–H Acylation via Radical Relay
作者:Yunquan Man、Shiwen Liu、Bo Xu、Xiaojun Zeng
DOI:10.1021/acs.orglett.1c04317
日期:2022.1.28
(NHC)-catalyzed benzylic C–H acylation with aldehydes via the hydrogen atomtransfer strategy is disclosed. This transformation involves a sequence of single-electron transfer, 1,5-hydrogenatomtransfer, and radical cross-coupling steps. This method offers facile access to various highly functionalized ketones and exhibits good chemical yields and functional group tolerance.
Testing the limits of radical-anionic CH-amination: a 10-million-fold decrease in basicity opens a new path to hydroxyisoindolines<i>via</i>a mixed C–N/C–O-forming cascade
作者:Quintin Elliott、Gabriel dos Passos Gomes、Christopher J. Evoniuk、Igor V. Alabugin
DOI:10.1039/c9sc06511c
日期:——
An intramolecular C(sp3)–H amidation proceeds in the presence of t-BuOK, molecular oxygen, and DMF. This transformation is initiated by the deprotonation of an acidic N–H bond and selective radical activation of a benzylic C–H bond towards hydrogen atom transfer (HAT). Cyclization of this radical–anion intermediate en route to a two-centered/three-electron (2c,3e) C–N bond removes electron density
Copper‐Catalyzed Arylation of Remote C(sp
<sup>3</sup>
)−H Bonds in Carboxamides and Sulfonamides
作者:Zhaodong Li、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201807623
日期:2018.10
Reported herein is an unprecedented copper‐catalyzed arylation of remote C(sp3)−H bonds. Stirring a trifluorotoluene solution of either N‐fluorocarboxamides or N‐fluorosulfonamides and arylboronicacids in the presence of a catalytic amount of copper(II) trifluoroacetylacetonate, 2,2′‐bipyridine, and sodium tert‐butoxide afforded the γ‐ and δ‐C(sp3)−H arylated carboxamides and sulfonamides, respectively
3-Substituted-4-aryl isoquinolines, e.g. 3-tertiary butyl-4-phenyl-1,2,3,4-tetrahydroisoquinoline, prepared from corresponding isoquinoline intermediates, are useful as anti-diabetic agents.
Copper-catalyzed intramolecular iminolactonization cyclization reactions of remote C(sp<sup>3</sup>)–H bonds in carboxamides
作者:He Wei、Zhenhua Zhang、Xiang Zhang、Shuo Gao、Tongtong Wang、Mengmeng Zhao、Pifeng Wei、Min Wang
DOI:10.1039/d2ob01711c
日期:——
heterocyclic compounds. Thus, the development of an efficient strategy for their preparation becomes highly desirable. A new method for the transformation of carboxamides into iminolactones via copper-catalyzed intramolecularC(sp3)–H bond functionalization is reported herein. A series of primary, secondary and tertiary C(sp3)–H bonds were all accommodated to afford iminolactones through a cascade process