在我们以前的研究中,我们已经表明,含有磷酸酯的硫脲化合物具有强大的抗肿瘤活性,可以用作开发抗肿瘤药物的新策略。本文合成了一系列新型的膦酸酯硫脲5–38,并通过1 H NMR,13 C NMR光谱,元素分析进行了全面表征。三种人类癌细胞系(Bcap-37,BGC-823和PC-3)已用于研究这些化合物的抗肿瘤活性。总结了结构-活性关系后,我们发现R,R 1和R 2的变化在这些新颖的膦酸酯硫脲中,它们具有抗肿瘤活性。所有这些在SAR指导下的努力都可能在不久的将来导致市场上出现新型抗肿瘤药物。
作者:Alistair J. M. Farley、Christopher Sandford、Darren J. Dixon
DOI:10.1021/jacs.5b10226
日期:2015.12.30
The highly enantioselective sulfa-Michael addition of alkyl thiols to unactivated α-substituted acrylate esters catalyzed by a bifunctional iminophosphorane organocatalyst under mild conditions is described. The strong Brønsted basicity of the iminophosphorane moiety of the catalyst provides the necessary activation of the alkyl thiol pro-nucleophile, while the two tert-leucine residues flanking a
The l -tert-leucine-derived AmidPhos/silver(I) catalytic system has been developed for the asymmetric [3+2] cycloaddition of azomethineylides with electronic-deficient alkenes with or without Et3N. Under optimal conditions, highly functionalized endo-4-pyrrolidines were obtained with modest to high yields (up to 99% yield) and enantioselectivities (up to 98% ee).
such bifunctional chiral molecules, either neutral or protonated species, was investigated in the addition of acetylacetone to β-nitrostyrene as a model reaction. Using the best conditions, high yields and enantioselectivities of up to 85% were obtained. The same metalfreecatalysts were then employed in the addition of activated nucleophiles to imines: in the reaction of 1,3-diketones with N-CBz imines
New thiourea organocatalysts and their application for the synthesis of 5-(1<i>H</i>-indol-3-yl)methyl-2,2-dimethyl-1,3-dioxane-4,6-diones a source of chiral 3-indoylmethyl ketenes
properties of modified thioureaorganocatalysts were tested in the Friedel–Crafts alkylation of indole with 5-arylidene-2,2-dimethyl-1,3-dioxane-4,6-diones, which produces chiral 5-((1H-indol-3-yl)(aryl)methyl)-2,2-dimethyl-1,3-dioxane-4,6-diones. Based on a tentative reaction mechanism for ((S)-N-benzyl-2-(3-(3,5-bis(trifluoromethyl)phenyl)thioureido)-N,3,3-trimethylbutanamide organocatalysts, modifications