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
Visible-light-induced cross-coupling of aryl iodides with hydrazones <i>via</i> an EDA-complex
作者:Pan Pan、Shihan Liu、Yu Lan、Huiying Zeng、Chao-Jun Li
DOI:10.1039/d2sc01909d
日期:——
photosensitizer-free cross-coupling of aryl iodides with hydrazones was developed. In this strategy, hydrazones were used as alternatives to organometallic reagents, in the absence of a transition metal or an external photosensitizer, making this cross-coupling mild and green. The protocol was compatible with a variety of functionalities, including methyl, methoxy, trifluoromethyl, halogen, and heteroaromatic
The first nickel-catalyzed, magnesium-mediated reductive cross-coupling between benzyl chlorides and arylchlorides or fluorides is reported. A variety of diarylmethanes can be prepared in good to excellent yields in a one-pot manner using easy-to-access mixed PPh3/NHC Ni(II) complexes of Ni(PPh3)(NHC)Br2 (NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene, IPr, 1a; 1,3-di-tert-butylimidazol-2-ylidene