Hansch’s analysis application to chalcone synthesis by Claisen–Schmidt reaction based in DFT methodology
作者:Marco Mellado、Alejandro Madrid、Úrsula Martínez、Jaime Mella、Cristian O. Salas、Mauricio Cuellar
DOI:10.1007/s11696-017-0316-3
日期:2018.3
Chalcones are bioactive compounds obtained from either natural sources or synthetic procedures and widely used due to their several biological properties. The most common experimental methodology in obtaining these compounds is Claisen–Schmidt reaction, which is a particular type of aldolic condensation. In this work, we have synthesized 23 chalcones and by density functional theory (DFT) calculation
A visible-light-driven and room temperature photo-Wolff-Kischner reaction of sulfur ylides and N-tosylhydrazones has been developed for the first time to provide modular access to alkene synthesis. The high functional group tolerance and broad substrate scope were demonstrated by more than 60 examples. Both E- and Z-olefinic stereochemistry in the products could be controlled with excellent stereoselectivity
Silica-supported synthesis of some 1,3,5-trisubstituted 2-pyrazolines under solvent-free and microwave irradiation conditions
作者:Davood Azarifar、Behrooz Maleki
DOI:10.1002/jhet.5570420125
日期:2005.1
A simple method for the synthesis of 2-pyrazolines is described which occurs on silica surface undersolvent-freeconditions within 110-180 sec using microwaveirradiation. The results obtained indicate that the use of silica gel as a support in pyrazoline formation reactions can have a profound effect on reaction rates and yields and cause cleaner reaction conditions.
Orchestrating a β-Hydride Elimination Pathway in Palladium(II)-Catalyzed Arylation/Alkenylation of Cyclopropanols Using Organoboron Reagents
作者:Thangeswaran Ramar、Murugaiah A. M. Subbaiah、Andivelu Ilangovan
DOI:10.1021/acs.joc.1c02735
日期:2022.4.1
scope of chemoselective β-hydride elimination in the context of arylation/alkenylation of homoenolates from cyclopropanol precursors using organoboronic reagents as transmetalation coupling partners was examined. The reaction optimization paradigm revealed a simple ligand-free Pd(II) catalytic system to be most efficient under open air conditions. The preparative scope, which was investigated with
Asymmetric Epoxidation of Unsaturated Ketones Catalyzed by Heterobimetallic Rare Earth–Lithium Complexes Bearing Phenoxy-Functionalized Chiral Diphenylprolinolate Ligand
作者:Qinqin Qian、Yufang Tan、Bei Zhao、Tao Feng、Qi Shen、Yingming Yao
DOI:10.1021/ol5020398
日期:2014.9.5
Four novel heterobimetalliccomplexes [REL2][(THF)3Li]2(μ-Cl)} stabilized by chiral phenoxy-functionalized prolinolate (RE = Yb (1), Y (2), Sm (3), Nd (4), H2L = (S)-2,4-di-tert-butyl-6-[[2-(hydroxydiphenylmethyl)pyrrolidin-1-yl]methyl]phenol have been synthesized and characterized. These readily available complexes are highly active in catalyzing the epoxidation of α,β-unsaturated ketones, while
四种新型双核配合物[REL 2 ] [(THF)3李] 2(μ-Cl)的}通过手性苯氧基官能化prolinolate稳定(RE =镱(1),Y(2),SM(3),钕(4),H 2 L =(小号)-2,4-二-叔已经合成并表征了丁基-6-[[[2-(羟基二苯基甲基)吡咯烷-1-基]甲基]苯酚。这些容易获得的络合物在催化α,β-不饱和酮的环氧化中具有高活性,而对映选择性根据稀土中心的离子半径而变化。在10 mol%的1存在下,使用TBHP作为氧化剂,在0°C于80→99%ee下,将一系列查尔酮衍生物转化为手性环氧化物。