CuFe<sub>2</sub>O<sub>4</sub> nanoparticles catalyze the reaction of alkynes and nitrones for the synthesis of 2-azetidinones
作者:Maaroof Zarei
DOI:10.1039/d0nj02660c
日期:——
CuFe2O4 nanoparticles acted as a highly efficient heterogeneous catalyst in the reaction of alkynes and nitrones (Kinugasa reaction) for the synthesis of various 2-azetidinones. In all cases, the reactions proceeded conveniently under mild conditions with good-to-excellent yields and with a wide range of functional-group tolerance. The catalyst could be separated readily using an external magnet.
CuFe 2 O 4纳米颗粒在炔烃和硝酮的反应(Kinugasa反应)中用于合成各种2-氮杂环丁酮,是一种高效的多相催化剂。在所有情况下,反应均在温和的条件下方便地进行,具有良好至优异的产率和宽泛的官能团耐受性。使用外部磁体可以容易地分离催化剂。
Development of TsDPEN based imine-containing ligands for the copper-catalysed asymmetric Kinugasa reaction
A novel class of chiral N,N,N imine-containing ligands derived from TsDPEN (N-(p-tosyl)-1,2-diphenylethylene-1,2-diamine) has been developed and applied to the copper-catalyzed asymmetricKinugasareaction. The copper(II) salt proved to be an efficient catalyst precursor, and it provides an efficient way to synthesize enantioenriched cis-β-lactam. The pathway is air-tolerant and easily manipulated
开发了一类新型的手性N , N , N亚胺配体,衍生自 TsDPEN ( N -( p -tosyl)-1,2-diphenylethylene-1,2-diamine) 并应用于铜催化的不对称衣笠反应。铜( II )盐被证明是一种高效的催化剂前体,它为合成富含对映体的顺式-β-内酰胺提供了一种有效的途径。该途径耐空气且易于操作,配体易于合成。提出了一个工作模型,其中立体控制步骤是乙烯酮和亚胺之间的 [2 + 2] 环加成,以解释观察到的立体选择性。
Enantioselective synthesis of β-lactams via the IndaBox–Cu(II)-catalyzed Kinugasa reaction
The enantioselective Kinugasareaction of nitrones with terminal alkynes in the presence of 20 mol % of IndaBox–Cu(OTf)2 and di-sec-butylamine (1.5 equiv) produced β-lactams with the highest level of enantiomeric excesses among the catalytic enantioselective Kinugasareactions reported so far.
The asymmetricKinugasareaction was performed on pure water for the first time without the need for any organic co‐solvents. In contrast to most asymmetricKinugasareactions, trans‐β‐lactams were obtained as the major products in good yields, enantioselectivities, and diastereoselectivities (up to 90 % yield, 98 % ee, and >99:1 d.r.). This reaction is atom‐economical, environmentally friendly, and