Ligand‐Facilitated Reductive Coupling of Benzyl Chlorides with Aryl Chlorides Catalyzed by Well‐Defined Heteroleptic Ni (II)‐NHC Complexes
作者:Gusheng Lu、Ruipeng Li、Zhengwang Shen、Qinjia Wu、Hongmei Sun
DOI:10.1002/aoc.5741
日期:2020.9
3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene), complex 1 exhibited superior catalytic activity in the magnesium‐mediated reductive coupling of benzyl chlorides with arylchlorides, featuring outstanding tolerance of both coupling partners with steric demand. This study discloses a ligand‐facilitated reductive coupling of benzyl chlorides with arylchlorides, which provides a new and practical synthetic
Metal-Free C–O Bond Functionalization: Catalytic Intramolecular and Intermolecular Benzylation of Arenes
作者:Luis Bering、Kirujan Jeyakumar、Andrey P. Antonchick
DOI:10.1021/acs.orglett.8b01495
日期:2018.7.6
conditions enabled a catalytic and metal-free Friedel–Craftsalkylation reaction with benzylic alcohols, producing water as the stoichiometric byproduct. A comprehensive scope (>50 examples) for both approaches and application in drug synthesis were demonstrated. Mechanistic studies suggest a Lewis acid-based mechanism for the metal-free Friedel–Crafts reaction.
Boron carbonitride photocatalysts for direct decarboxylation: the construction of C(sp<sup>3</sup>)–N or C(sp<sup>3</sup>)–C(sp<sup>2</sup>) bonds with visible light
作者:Jiale Shi、Tao Yuan、Rong Wang、Meifang Zheng、Xinchen Wang
DOI:10.1039/d1gc00922b
日期:——
functionalization of acids via metal-free boron carbon nitride (BCN) photocatalysis, delivering the desired products underambientconditions. This methodology is applicable to the late-stage modification of pharmaceutical molecules and gram-scale experiments as well as in the recovery and reuse of the photocatalysts without the loss of reactivity. The developed photochemical reaction system fulfills the requirements
Efficient N-heterocyclic carbene nickel pincer complexes catalyzed cross coupling of benzylic ammonium salts with boronic acids
作者:Xi-Yu Liu、Hai-Bo Zhu、Ya-Jing Shen、Jian Jiang、Tao Tu
DOI:10.1016/j.cclet.2016.09.006
日期:2017.2
Abstract Pyridine-bridgedbis-benzimidazolylidene nickel complexes exhibited very high catalytic activity toward cross coupling of inactive (hetero)aryl benzylic ammonium salts with (hetero)aryl and alkenyl boronic acids under mild reaction conditions. Even at 2 mol% catalyst loading, a wide range of substrates for both coupling partners with different steric and electronic properties were well tolerated
Heteroleptic Ni(II) Complexes Bearing a Bulky Yet Flexible IBiox-6 Ligand: Improved Selectivity in Cross-Electrophile Coupling of Benzyl Chlorides with Aryl Chlorides/Fluorides
作者:Zheng-Wang Shen、Die-Die Meng、Sajid Imran、Chun-Hui Yan、Hong-Mei Sun
DOI:10.1021/acs.organomet.0c00515
日期:2020.10.12
Ni(PPh3)2Br2 to give the respective heteroleptic Ni(II) complexes Ni(IBiox-6)[P(OEt)3]Br2 (1) and Ni(IBiox-6)(PPh3)Br2 (2) in yields of 60% and 71%. Their crystal structures were characterized to reveal a rare cis disposition of the IBiox-6 ligand to the phosphite ligand in 1, while 2 possessed the more common trans configuration. Both complexes catalyzed the cross-electrophile coupling of benzyl chlorides