Fe(Cp)2BF4: An Efficient Lewis Acid Catalyst for the Aminolysis of Epoxides
作者:Surendra Singh、Geeta Yadav、ManMohan Chauhan
DOI:10.1055/s-0033-1340498
日期:——
yields at 60 °C under solvent-free conditions. Ferrocenium tetrafluoroborate [Fe(Cp)2BF4] is an efficient Lewis acid catalyst for the aminolysis of aromatic, aliphatic, and cyclic epoxides using aniline and substituted anilines as the nucleophile to provide regioselectiveβ-aminoalcohols in 61–97% yields under solvent-free conditions at room temperature. The ring opening of cyclohexene oxide with aliphatic
Vanadium(III) Chloride-Catalyzed Preparation of β-Amino Alcohols from Epoxides
作者:Gowravaram Sabitha、G. S. Kumar Reddy、K. Bhaskar Reddy、J. S. Yadav
DOI:10.1055/s-2003-41070
日期:——
Vanadium(III) chloride was found to catalyze the cleavage of epoxides with aromatic amines in an efficient way to afford the corresponding β-amino alcohols in very good yields. The reactions are completely anti-stereoselective, highly regioselective and proceed at room temperature.
A highly effective protocol for ring opening of epoxides with allyl and propargyl alcohols, aniline and thiophenol in the presence of catalytic amounts of B(C6F5)(3) has been developed. Benzyl, tetrahydropyranyl, tert-butyldimethyl silyl protecting groups were stable under the reaction conditions. (C) 2002 Elsevier Science Ltd. All rights reserved.
Microwave‐Assisted Cleavage of Epoxides with Amines in the Presence of the Catalytic Zn(OAc)<sub>2</sub>/1,7‐Bis(2‐Benzoic Acid)‐1,4,7‐Trioxaheptane (ZnBBATOH)
We describe a highly regioselective ring opening of epoxides with aromatic amines in the presence of a catalytic amount of Zn(OAc)(2) and 1,7-bis(2-benzoic acid)-1,4,7-trioxaheptane under microwave irradiation. The yields of the amino alcohols a-re mostly good and the recovered catalyst could be reused several times.
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.