Iron-Catalyzed Selective Oxidation of <i>N</i>-Methyl Amines: Highly Efficient Synthesis of Methylene-Bridged bis-1,3-Dicarbonyl Compounds
作者:Haijun Li、Zhiheng He、Xingwei Guo、Wenjuan Li、Xuhui Zhao、Zhiping Li
DOI:10.1021/ol901751c
日期:2009.9.17
Methylene-bridged bis-1,3-dicarbonyl derivatives were synthesized efficiently by iron-catalyzed oxidative reactions of 1,3-dicarbonylcompounds and N,N-dimethylaniline. Bipyrazoles and substituted 1,4-dihydropyridine were obtained by the reactions of bis-1,3-dicarbonyl compounds with hydrazines and ammonium acetate, respectively.
Rose Bengal-photosensitized oxidation of tertiary amines for the synthesis of bis-1,3-dicarbonyl compounds
作者:Ling-Ling Wu、Li Tang、Shui-Gen Zhou、Yi-Jie Peng、Xiao-Dong He、Zhi Guan、Yan-Hong He
DOI:10.1016/j.tet.2017.09.050
日期:2017.11
We report an example of Rose Bengal-photosensitized oxidation of tertiaryamines for the synthesis of bis-1,3-dicarbonyl compounds. This protocol employs Rose Bengal as a visible-light absorbing photocatalyst without the need of a transition metal, and air as a green oxidant. Various functional groups were well tolerated to afford products with yields of up to 80% under mild reaction conditions.
efficient and simple synthetic approach has been developed for the synthesis of bis-1,3-dicarbonyl compounds via visible light-mediated oxidation of tertiary amines in the presence of CsPbBr3 perovskite. This heterogeneous photocatalyst exhibits highly catalytic activity and broad applicability to a variety of substrates. It can be recycled by simple centrifugal filtration and reused several times without
Metal-Free Csp3–N Bond Cleavage of Amides Using tert-Butyl Hydroperoxide as Oxidant
作者:Hu Cai、Shengmei Guo、Zheng Zhu、Lin Lu、Wenbiao Zhang、Jiuhan Gong
DOI:10.1055/s-0034-1379879
日期:——
A mild and efficient protocol for the metal-free C-N bond-cleavage of amides has been developed. The methodology employs iodine as a catalyst to cleave the C(Me)-N bond of dimethylformamide or dimethylacetamide, providing novel access to methylene-bridged bis-1,3-dicarbonyl compounds instead of enol carbamates in the presence of tert-butyl hydroperoxide.
A metal-free strategy for the cross-dehydrogenative coupling of 1,3-dicarbonyl compounds with 2-methoxyethanol
作者:Vishal Suresh Kudale、Sheng Zheng、Sheng-Hua Huang、Yu-Lun Chang、Jeh-Jeng Wang
DOI:10.1039/d1ob02290c
日期:——
we report a metal-free approach for the construction of methylene-bridged bis-1,3-dicarbonyl compounds via cross-dehydrogenative coupling of 1,3-dicarbonylcompounds with 2-methoxyethanol. In addition, we have extended this methodology to synthesize tetra-substituted pyridine derivatives using 1,3-dicarbonyl, 2-methoxyethanol and NH4OAc in one step. The key advantages include accepting a wide range
在这里,我们报告了一种通过1,3-二羰基化合物与 2-甲氧基乙醇的交叉脱氢偶联来构建亚甲基桥连双 1,3-二羰基化合物的无金属方法。此外,我们扩展了这一方法,以一步合成四取代吡啶衍生物,使用 1,3-二羰基、2-甲氧基乙醇和 NH 4 OAc。主要优势包括接受广泛的底物,利用 O 2作为唯一氧化剂,以及合成生物活性化合物,如 1,4-二氢吡啶和吡唑。