An efficient method for regioselective ring opening of epoxides by amines under microwave irradiation using Bi(NO<sub>3</sub>)<sub>3</sub>·5H<sub>2</sub>O as a catalyst
作者:Shobha Bansal、Yogendra Kumar、Parveen Pippal、Dipak K. Das、Panchanan Pramanik、Prabal P. Singh
DOI:10.1039/c6nj03701a
日期:——
Bismuth(III)nitrate pentahydrate, a highly efficient environmentally benign catalyst, is used for the nucleophilic ringopening of epichlorohydrin and styrene oxide with aromatic, aliphatic and heteroaromatic amines under solvent free microwave conditions reducing the reaction time drastically to afford the corresponding β-amino alcohols in good to excellent yields with high regioselectivity. The products obtained were
硝酸铋(III)五水合物,一种高效的环境友好型催化剂,用于在无溶剂微波条件下与芳香族,脂肪族和杂芳香族胺一起对环氧氯丙烷和氧化苯乙烯进行亲核开环,从而大大缩短了反应时间,从而提供了相应的β-氨基醇具有良好的收率和优异的选择性,并具有较高的区域选择性。获得的产物通过柱色谱法直接纯化,并通过1 H和13 C NMR,FTIR和质谱进行表征。
Efficient solvent-free aminolysis of epoxides under (C4H12N2)2[BiCl6]Cl·H2O catalysis
An efficient and rapid procedure for ring opening of various epoxides with aromatic, aliphatic and heterocyclicamines is developed at room temperature under solvent-free conditions in the presence of (C4H12N2)2[BiCl6]Cl·H2O (1 mol %). This catalyst can be reused several times without losing of its activity.
在(C 4 H 12 N 2)2 [BiCl 6 ] Cl·H 2 O存在下,在室温下在无溶剂的条件下,开发了一种高效快速的方法,可用于芳族,脂族和杂环胺的各种环氧化物的开环。(1摩尔%)。该催化剂可以重复使用几次而不会失去其活性。
Stereocontrolled, Divergent, Al(lll)-Catalyzed Coupling of Chiral <i>N</i>-Aryl Epoxy Amines and CO<sub>2</sub>
作者:Yuseop Lee、Jonghoon Choi、Hyunwoo Kim
DOI:10.1021/acs.orglett.8b02186
日期:2018.8.17
achieved between N-aryl epoxy amines and CO2. By using two different cocatalysts, tetrabutylammonium iodide (TBAI) or 4-dimethylaminopyridine (DMAP) together with an Al(III) Lewis acid, cycliccarbonates or oxazolidinones were selectively produced through two distinct reaction pathways, respectively. The proposed reaction mechanism was supported by the stereochemical determination of the products. A
Fe(III) substituted Wells–Dawson type polyoxometalate: An efficient catalyst for ring opening of epoxides with aromatic amines
作者:N. Aramesh、B. Yadollahi、V. Mirkhani
DOI:10.1016/j.inoche.2012.11.005
日期:2013.2
Abstract Various β -aminoalcohols were prepared by the ring opening reaction of epoxides with aromatic amines in the presence of Fe(III) substituted Wells–Dawson type polyoxometalate, α 2 -[(n-C 4 H 9 ) 4 N] 7 P 2 W 17 FeO 61 ·3H 2 O, as an efficient catalyst. The reaction was performed under neutral condition at room temperature and afforded the corresponding products in high to excellent yields.
摘要 在 Fe(III) 取代的 Wells-Dawson 型多金属氧酸盐 α 2 -[(nC 4 H 9 ) 4 N] 7 P 2 W 17 存在下,通过环氧化物与芳香胺的开环反应制备了各种 β-氨基醇。 FeO 61 ·3H 2 O,作为一种高效的催化剂。该反应在室温下中性条件下进行,并以高产率至极好的收率提供相应的产物。
Bismuth(III) trifluoromethanesulfonate and trifluoroacetate as convenient and efficient catalysts for regio- and chemoselective ring opening of epoxides in reactions with anilines
作者:A. R. Khosropour、M. M. Khodaei、K. Ghozati
DOI:10.1007/s11178-005-0016-2
日期:2004.9
Bismuth(III) trifluoromethanesulfonate and trifluoroacetate are highly efficient and practical catalysts for oxirane ring opening in reactions of epoxides with substituted anilines. The reactions are characterized by high chemoselectivity and good to excellent yields of the products.