72496-78-7Relevant articles and documents
Recyclable Cellulose-Derived Fe3O4@Pd NPs for Highly Selective C–S Formation by Heterogeneously C–H Sulfenylation of Indoles
Li, Shengyi,Wang, Jinguo,Jin, Jianzhong,Tong, Jianying,Shen, Chao
, p. 2409 - 2414 (2020/02/25)
Abstract: An efficient and convenient method was developed for the preparation of 3-sulfenylindoles via a cellulose-derived Fe3O4@Pd NPs catalyzed heterogeneously C–H sulfenylation of indoles. This approach provides an effective synthetic route to an important class of indoles derivatives and features high efficiency, easy operation, good practicality, and environmental friendliness. The recoverable catalyst was separated from the reaction mixture using an outside magnetic field and can be recycled five times without huge loss of catalytic performance. Graphic Abstract: An efficient method was developed for the preparation of 3-sulfenylindoles via cellulose-derived Fe3O4@Pd NPs catalyzed heterogeneously C–H sulfenylation of indoles.[Figure not available: see fulltext.].
Synthesis of a new series of Ni(II), Cu(II), Co(II) and Pd(II) complexes with an ONS donor Schiff base: Crystal structure, DFT study and catalytic investigation of palladium and nickel complexes towards deacylative sulfenylation of active methylenes and regioselective 3-sulfenylation of indoles: Via thiouronium salt formation
Devi, Namita,Sarma, Kuladip,Rahaman, Rajjakfur,Barman, Pranjit
, p. 4583 - 4595 (2018/04/03)
A series of Ni(ii), Cu(ii), Co(ii), and Pd(ii) complexes have been synthesized with a chelating Schiff base ligand coordinated to a metal center with ONS donor atoms. The ligand and complexes are characterized by elemental analysis and spectroscopic techniques like FT-IR, 1H-NMR, and UV-Visible spectroscopy. The single crystal structure of the Pd(ii) complex is obtained by X-ray diffraction analysis and exhibits slightly distorted square planar geometry. The structure is optimized by DFT, TD-DFT calculation to elaborate the electronic structure and NBO for the charge distribution analysis of the Pd(ii) complex. The synthesized Pd(ii) and Ni(ii) complexes as catalysts have been investigated in the C-S cross-coupling of indoles and active methylenes. The metal propelled regioselective transformation afforded 3-sulfenylated indoles while β-diketones favored deacylated monosulfenyl ketones in an excellent yield via thiouronium salt formation. The Pd(ii) complex displays slightly better reactivity whereas the Ni(ii) complex is cost-efficient. The method is fast, easy to handle and cost effective in terms of high reactivity of catalysts, use of non-toxic solvents, and cheaper aryl halides and thiourea replace conventional sulfur sources, providing a practical access to organic transformations.
Microwave-assisted regioselective sulfenylation of indoles under solvent- and metal-free conditions
Rahaman, Rajjakfur,Devi, Namita,Bhagawati, Jyoti Rekha,Barman, Pranjit
, p. 18929 - 18935 (2016/03/01)
Herein, we report a solvent- and metal-free methodology for the sulfenylation of indoles with sulfinic acids in the absence of an external catalyst under microwave irradiation. This environmentally friendly approach offered the desired products in moderate to excellent yields in only 10 min. Several functional group tolerances were monitored under the optimized conditions.
