Metal-catalyzed coupling process comprising reacting a compound of general formula 1 with a compound A-X, to obtain a compound of general formula 2, which may further be converted to a compound of general formula 3
Substitution of the Nitro Group with Grignard Reagents: Facile Arylation and Alkenylation of Pyridine <i>N</i>-Oxides
作者:Fang Zhang、Song Zhang、Xin-Fang Duan
DOI:10.1021/ol3026632
日期:2012.11.2
unprecedented substitution of a nitro group with aryl or alkenyl groups of Grignard reagents affords 2-aryl or alkenylpyridine N-oxides in modest to high yields with high chemoselectivity. This protocol allows a simple and clean synthesis of various 2-substituted pyridineN-oxides and the corresponding pyridine derivatives. Furthermore, straightforward one-pot iterative functionality of pyridineN-oxides could
A novel direct arylation of pyridineN-oxides with arylboronic acids through C-H functionalization has been developed. This new reaction is performed at room temperature using catalytic silver(l) nitrate in the presence of potassium persulfate and give 2-pyridyl arylation derivatives of pyridineN-oxides.
moiety followed by β-C elimination strategy was less studied. Here a palladium-catalyzed C–C bond activation of an unstrained ketone enabled by a removable directing group through β-C elimination to synthesize 2-arylpyridine is described. The protocol features wide substrate scope with yields up to 95%, good functional group tolerance, and functionality of natural products. The 2-arylpyridine N-oxide
Palladium‐Catalyzed Directed Atroposelective C−H Iodination to Synthesize Axial Chiral Biaryl N‐Oxides via Enantioselective Desymmetrization Strategy
作者:Linxi Yao、Alemayehu Gashaw Woldegiorgis、Shaoying Huang、Yongtao Wang、Xufeng Lin
DOI:10.1002/chem.202203051
日期:2023.1.24
Pd(II) coordinated by N-benzoyl-l-phenylalanine has been identified as a highly enantioselective catalyst for atroposelectiveC−Hiodination at room temperature via desymmerization strategy providing nearly enantiopure samples of a diverse range axiallychiralbiaryl N-oxides. Mechanistic investigation disclosed the factors that lead to high reactivity and excellent enantiocontrol.
由N -苯甲酰基 - l -苯丙氨酸配位的 Pd(II)已被确定为一种高度对映选择性催化剂,可在室温下通过去对称化策略进行阻转选择性 C-H 碘化,提供各种轴向手性联芳基 N -氧化物的近对映体纯样品。机理研究揭示了导致高反应性和出色对映体控制的因素。