Palladium-Catalyzed Denitrative α-Arylation of Ketones with Nitroarenes
作者:Zhirong Li、Yonggang Peng、Tao Wu
DOI:10.1021/acs.orglett.0c04104
日期:2021.2.5
The palladium-catalyzed α-arylation of ketones with readily available nitroarenes and nitroheteroarenes provides access to useful α-aryl and α-heteroaryl ketones. The use of the Pd/BrettPhos catalysts was critical to achieve high efficiency for these transformations, whereas other catalysts led to decreased yields or no conversions. The intramolecular type substrate was also applied in this methodology
1,2‐Aryl Migration Induced by Amide C−N Bond‐Formation: Reaction of Alkyl Aryl Ketones with Primary Amines Towards α,α‐Diaryl β,γ‐Unsaturated γ‐Lactams
作者:Rong Hu、Yigao Tao、Xiaofeng Zhang、Weiping Su
DOI:10.1002/anie.202014900
日期:2021.4.6
that incorporates an unusual 1,2‐aryl migration induced by amide C−N bond formation to produce a class of structurally novel α,α‐diaryl β,γ‐unsaturated γ‐lactams in generally good‐to‐excellent yields. This cascade reaction has a broad substrate scope with respect to primary amines, allows a wide spectrum of (hetero)aryl groups to smoothly undergo 1,2‐migration, and tolerates electronically diverse
A novelcatalyticsystem based on copper(I) and chiral bis(phosphine) dioxides is described. This allows the arylation of silyl enol ethers to access enolizable α-arylated ketones in good yields and enantiomeric excess up to 95%. Noncyclic ketones are amenable substrates with this method, which complements other approaches based on palladium catalysis. Optimization of the ligand structure is accomplished
Nickel catalyzed α-arylation of ketones with aryltrimethylammonium triflates
作者:Jing Li、Zhong-Xia Wang
DOI:10.1039/c6ob01299j
日期:——
Nickel-catalyzed α-arylation of ketones involving aromatic C–N cleavage has been accomplished. Intermolecular coupling of aromatic ketones with a variety of aryltrimethylammonium triflates was achieved in the presence of Ni(COD)2, IPr·HCl, and LiOBut, giving α-arylated ketones in reasonable to excellent yields.
α-Hydroxylation of α,α-Disubstituted <i>N</i>-<i>tert</i>-Butanesulfinyl Ketimines with Molecular Oxygen: Stereoselective Synthesis of α-Tertiary Hydroxyimines
作者:Nuermaimaiti Yisimayili、Hui Liu、Yun Yao、Chong-Dao Lu
DOI:10.1021/acs.orglett.1c04198
日期:2022.1.21
α-Tertiary hydroxyimines were stereoselectively synthesized from enantioenriched N-tert-butanesulfinyl ketimines using potassium tert-butoxide, molecular oxygen, and trimethyl phosphite. The stereoselective hydroxylation of acyclic ketimines bearing two sterically similar α-substituents was achieved by controlling the geometry of the metalloenamine intermediates and the facial selectivity of hydroxylation