Mild regiospecific alcoholysis and aminolysis of epoxides catalyzed by zirconium(IV) oxynitrate
作者:Sandip S. Shinde、Madhukar S. Said、Trupti B. Surwase、Pradeep Kumar
DOI:10.1016/j.tetlet.2015.09.031
日期:2015.10
A regiospecific method for the ring-opening reaction of epoxides by the primary, secondary, tertiary alcohols, and aryl, aliphatic amines has been developed using non-toxic metal nitrate salt as a catalyst. The best results were obtained using zirconium(IV) oxynitrate among the various screened metal nitrate salts. The reported protocol works efficiently for styrene epoxide and aliphatic as well.
A urea-containing metal-organic framework as a multifunctional heterogeneous hydrogen bond-donating catalyst
作者:Chengfeng Zhu、Haitong Tang、Keke Yang、Xiang Wu、Yunfei Luo、Jin Wang、Yougui Li
DOI:10.1016/j.catcom.2019.105837
日期:2020.2
A urea-containing metal-organicframework (MOF) was synthesized from a V-shaped dicarboxylate ligand and Cu(II) ions. As the undesirable self-aggregation of the urea moiety has been prohibited in the framework, this MOF can act as a heterogeneous hydrogen bond-donating (HBD) catalyst, which accelerates the cyanosilylation reaction of aldehydes, the Henry reaction of aldehydes, and the methanolysis
Ring opening of epoxides with alcohols using Fe(Cp)2BF4 as catalyst
作者:Geeta Devi Yadav、Surendra Singh
DOI:10.1016/j.tetlet.2014.05.017
日期:2014.7
Fe(Cp)(2)BF4 is an efficient catalyst for the alcoholysis of aromatic, aliphatic, and cyclic epoxides giving excellent yields of the corresponding beta-alkoxy alcohols under ambient conditions. The methanolysis of styrene oxide using Fe(Cp)(2)BF4 as a catalyst (5 mol %) gave excellent yield of 2-methoxy-2-phenylethanol with complete regio-selectivity. The ring opening of cyclic epoxides gave 77-97% yields of trans-beta-methoxy alcohols, in 0.5-6 h. The use of 1,2-epoxyhexane and 1,2-epoxydodecane as substrates gave both regioisomers in excellent yields. The first order rate of reaction with respect to catalyst was observed for the kinetics of ring opening of 1,2-epoxyhexane with methanol. (C) 2014 Elsevier Ltd. All rights reserved.
Cellulose sulfate: An efficient heterogeneous catalyst for the ring-opening of epoxides with alcohols and anilines
acts as a heterogeneous catalyst for the ring-opening of epoxides with alcohols or anilines and the Friedel-Crafts reaction between N-benzylindole and crotonaldehyde at room temperature. Methanolysis of cyclic epoxides, styrene oxide, terminal aliphatic epoxides, and glycidyl ethers were carried out using the catalyst (0.4–6.8 mg/mmol of epoxide) and afforded the corresponding products in 53–97% isolated