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.
Oxone-DMSO Triggered Methylene Insertion and C(sp<sup>2</sup>)−C(sp<sup>3</sup>)-H−C(sp<sup>2</sup>) Bond Formation to Access Functional Bis-Heterocycles
作者:Jaspreet Kour、Vunnam Venkateswarlu、Praveen K. Verma、Yaseen Hussain、Gurudutt Dubey、Prasad V. Bharatam、Subash C. Sahoo、Sanghapal D. Sawant
DOI:10.1021/acs.joc.9b03477
日期:2020.4.3
Metal-free insertion of a methylene group was achieved for the construction of a new C(sp2)–C(sp3)-H–C(sp2) bond in order to prepare novel bis-heterocyclic scaffolds. The complete mechanistic investigations included experimental study and DFT calculations, and various symmetric and unsymmetric bis-pyrazoles as well as other pyrazole-based bis-heterocyclic molecules were prepared in moderate to high