Dinucleating Schiff base ligand in Zn/4f coordination chemistry: synthetic challenges and catalytic activity evaluation
作者:Stavroula I. Sampani、Sidonie Aubert、Martin Cattoen、Kieran Griffiths、Alaa Abdul-Sada、Geoffrey R. Akien、Graham J. Tizzard、Simon J. Coles、Stellios Arseniyadis、George E. Kostakis
DOI:10.1039/c8dt00538a
日期:——
time. These air-stable heterometallic PCCs, obtained in high yields from commercially available materials, were shown to remain stable in solution in their dinuclear [ZnIILnIIIL] form. Their catalytic activity was evaluated in various catalytic transformations including the Friedel–Craftsalkylation of 2-acyl imidazoles with indoles.
四的Zn / 4F多核协调集群(PCC的)配制为[锌II 2的Dy III 2大号2(CO 3)2(NO 3)2 ](1),[锌II ý III L(NO 3)2(ø - van)(MeOH)](MeOH)[ 2(MeOH)]和[Zn II Ln III L(NO 3)2 Cl(EtOH)],其中Ln是Dy(3)和Y(4),其中H 2 L是双核席夫碱配体制备了N,N′-双(3-甲氧基水杨基)环己烷-1,2-二胺和邻-van为邻-香兰素,并首次对其进行了充分表征。这些可从市场上买到的材料以高收率获得的空气稳定的杂金属PCC,在其双核[Zn II Ln III L]形式下,在溶液中保持稳定。在各种催化转化中评估了它们的催化活性,包括2-吲哚咪唑与吲哚的Friedel-Crafts烷基化反应。
Using the DNA-based catalysis concept, a novel Cu(ii) catalyzed enantioselective oxa-Michael addition of alcohols to enones is reported. Enantioselectivities of up to 86% were obtained. The presence of water is important for the reactivity, possibly by reverting unwanted side reactions such as 1,2-additions.