描述了一系列[2-取代-4,5-双(氨基甲基)-1,3-二氧戊环]铂(II)配合物的合成,物理性质,抗肿瘤活性,结构活性关系和肾毒性。已制备了该系列中具有七元环结构的42种铂(II)配合物,并通过1 H NMR,13 C NMR,IR,FAB-MS和元素分析对其进行了表征。该系列的所有成员均设计成在其载体配体中具有1,3-二氧戊环环部分以增加水溶性。铂配合物的溶解度与在4,5-双(氨基甲基)-1,3-二氧戊环载体配体中剩余配体和2-取代基的性质有关。通常,在4,5-双(氨基甲基)-1,3-二氧戊环部分中具有两个不同的R 1和R 2取代基的化合物比具有相同取代基的化合物具有更高的水溶性。该系列的大多数成员对移植到小鼠中的小鼠L1210白血病细胞显示出优异的抗肿瘤活性,并且优于顺铂和卡铂。(4R,5R)-立体异构体1a-h在(1,1-环丁烷二羧基)铂(II)配合物中比相应的(4S,5S)-立体
highly enantioselective α-hydroxylation of β-ketoesters using cumene hydroperoxide (CHP) as the oxidant was realized by a chiral (1S,2S)-cyclohexanediamine backbone salen-zirconium(IV) complex as the catalyst. A variety of corresponding chiral α-hydroxy β-ketoesters were obtained in excellent yields (up to 99%) and enantioselectivities (up to 98% ee). The zirconium-catalyzed enantioselective α-hydroxylation
Chiral (macrocyclic)sulphides as ligands for nickel catalysed carbon-carbon bond formation
作者:Marc Lemaire、Jan Buter、Bindert K. Vriesema、Richard M. Kellogg
DOI:10.1039/c39840000309
日期:——
Various sulphide combinations have been synthesized and examined as ligands for the NiIICatalysed cross coupling of α-phenylethylmagnesium chloride and vinyl bromide; good yields and, in some cases, modest enantiomeric excesses can be obtained.