Novel Regioselectivity: Three-Component Cascade Synthesis of Unsymmetrical 1,4- and 1,2-Dihydropyridines
作者:Jie-Ping Wan、Shi-Feng Gan、Gong-Lei Sun、Yuan-Jiang Pan
DOI:10.1021/jo900068z
日期:2009.4.3
of α,β-unsaturated aldehydes, amines, and enaminones proceeded smoothly to give 1,3,4-trisubstituted 1,4-dihydropyridines in aqueous DMF. Moreover, the unexpected regioselective formation of 1,2-dihydropyridines has been observed for the first time in such an approach. On the basis of a systematic study, the novel regioselectivity could be assigned both to steric and electronic effects originating from
Intermolecular Multiple Dehydrogenative Cross‐Couplings of Ketones with Boronic Acids and Amines via Copper Catalysis
作者:Tianzhang Wang、Guowei Chen、Yu‐Jing Lu、Qian Chen、Yanping Huo、Xianwei Li
DOI:10.1002/adsc.201900419
日期:2019.8.21
versatile oxidative coupling reaction was developed for the synthesis of valuable β‐functionalized unsaturatedketones and meta‐substituted phenols. In the case of intramolecular reactions, achieving rapid molecular complexity through multiple dehydrogenative couplings is already a well‐established strategy. Herein, we report an intermolecular multiple dehydrogenative coupling between ketones and nucleophilic
Enaminones in Heterocyclic Synthesis: A Novel Route to Polyfunctionalized Substituted Thiophene, 2,3-Dihydro-1,3,4-Thiadiazole and Naphtho[1,2- b ] Furan Derivatives
作者:Zaghloul E. Kandeel、Khadija M. Al-Zaydi、Ebtisam A. Hafez、Mohamed H. Elnagdi
DOI:10.1080/10426500210232
日期:2002.1.1
The enaminones 1a , b reacted with phenylisothiocyanate to afford the thioanilides 2a , b . The latter could be utilized to synthesize several new polysubstituted thiophenes 9a-f , and 1,3,4-thiadiazoles 12a-f .
A Method for the Preparation of β-Amino-α,β-unsaturated Carbonyl Compounds: Study of Solvent Effect and Mechanism
作者:Reyno R. S.、Akash Sugunan、Ranganayakulu S.、Cherumuttathu H. Suresh、Goreti Rajendar
DOI:10.1021/acs.orglett.9b04531
日期:2020.2.7
An efficient method for the preparation of β-amino-α,β-unsaturated carbonylcompounds is demonstrated. Bench-stable sodium 3-oxo-enolates were prepared from carbonylcompounds, and reacted with amines in the presence of an acid and a desiccant. DFT studies revealed contrasting mechanisms toward the reactivity of aliphatic amines in protic solvents and aromatic amines in aprotic solvents. While the