Formal [4 + 1] annulation of fluorinated sulfonium salt with cyclic unsaturated imines to access CF<sub>3</sub>-substituted pyrroles
作者:Tao Chen、Aoning Wang、Linxue Zhang、Chenlong Wei、Juhui Huang、Xiang Liu、Zhenqian Fu
DOI:10.1039/d1ob00218j
日期:——
Formal [4 + 1] annulation of easily available fluorinated sulfonium salt with cyclic unsaturated imines has been successfully developed. A structurally diverse set of CF3-substituted dihydropyrroles was efficiently constructed in acceptable to excellent yields with excellent diastereoselectivities. The resulting CF3-containing dihydropyrroles from this transition metal-free strategy could be easily
Enantioselective phospha-Michael reaction of diethyl phosphonate with exocyclic α,β-unsaturated benzocyclic ketones catalyzed by a dinuclear zinc−AzePhenol catalyst
作者:Na Shao、Yong-Yang Luo、Hui-Jie Lu、Yuan-Zhao Hua、Min-Can Wang
DOI:10.1016/j.tet.2018.03.016
日期:2018.4
The dinuclear zinc complexes as high performance catalysts were used to catalyze phospha-Michael reaction of exocyclic α,β-unsaturated benzocyclic ketones under mild conditions, and the desired products possessing 1-indanones or 1-tetralones skeleton were obtained with excellent enantioselectivities of up to 99%/99% ee and yields of up to 99%. The absolute stereochemistry of the major products catalyzed
Evaluation of Silica-H2SO4 as an Efficient Heterogeneous Catalyst for the Synthesis of Chalcones
作者:Aeysha Sultan、Abdul Raza、Muhammad Abbas、Khalid Khan、Muhammad Tahir、Nazamid Saari
DOI:10.3390/molecules180810081
日期:——
We report an efficient silica-H2SO4 mediated synthesis of a variety of chalcones that afforded the targeted compounds in very good yield compared to base catalyzed solvent free conditions as well as acid or base catalyzed refluxing conditions.
Ash of pomegranate peels (APP): A bio-waste heterogeneous catalyst for sustainable synthesis of α,α′-bis(substituted benzylidine)cycloalkanones and 2-arylidene-1-tetralones
作者:Rupesh C. Patil、Uttam P. Patil、Ashutosh A. Jagdale、Sachinkumar K. Shinde、Suresh S. Patil
DOI:10.1007/s11164-020-04160-5
日期:2020.7
Abstract α,α′-bis(substituted benzylidene)cycloalkanones were efficiently prepared from variously substituted aldehydes and cycloalkanones in water by using ash of pomegranate peels (APP) as a catalyst. The APP-catalyst was obtained from bio-waste by simple thermal treatment to dry peels of pomegranate fruit and formation of its active phase was confirmed by FT-IR, XRD, XRF, EDX, SEM, DSC-TGA and BET
Synthesis, characterization and spectroscopic behavior of novel 2-oxo-1,4-disubstituted-1,2,5,6-tetrahydrobenzo[h]quinoline-3-carbonitrile dyes
作者:Salman A. Khan、Abdullah M. Asiri、Saad H. Al-Thaqafy、Hassan M. Faidallah、Samy A. El-Daly
DOI:10.1016/j.saa.2014.05.013
日期:2014.12
Two synthetic pathways were adopted to synthesize the target 2-oxo-1,4-disubstituted-1,2,5,6-tetrahydro-benzo[h]quinoline-3-carbonitriles. Structure of the synthesized compounds has been characterized based on FT-IR, H-1 NMR, C-13 NMR and elemental analyses. UV-Vis and fluorescence spectroscopy measurements provided that all compounds are good absorbent and fluorescent. Fluorescence polarity study demonstrated that these compounds were sensitive to the polarity of the microenvironment provided by different solvents. In addition, spectroscopic and physicochemical parameters, including singlet absorption, extinction coefficient, Stokes shift, oscillator strength and dipole moment were investigated in order to explore the analytical potential of synthesized compounds. (C) 2014 Elsevier B.V. All rights reserved.