Influence of chain length on the activity of tripeptidomimetic antagonists for CXC chemokine receptor 4 (CXCR4)
作者:Markus Baumann、Mohammad Musarraf Hussain、Nina Henne、Daniel Moya Garrote、Stefanie Karlshøj、Torgils Fossen、Mette M. Rosenkilde、Jon Våbenø、Bengt Erik Haug
DOI:10.1016/j.bmc.2016.11.036
日期:2017.1
close analogues of our recently published scaffold-based tripeptidomimetic CXCR4 antagonists, containing positively charged guanidino groups in R1 and R2, and an aromatic group in R3. While contraction/elongation of the guanidine carrying sidechains (R1 and R2) resulted in loss of activity, introduction of bromine in position 1 on the naphth-2-ylmethyl moiety (R3) resulted in an EC50 of 61 μM (mixture
[EN] COMPOSITIONS AND METHODS FOR SELECTIVELY DEPLETING SENESCENT CELLS<br/>[FR] COMPOSITIONS ET PROCÉDÉS DE DÉPLÉTION SÉLECTIVE DE CELLULES SÉNESCENTES
申请人:UNIV ARKANSAS
公开号:WO2016014625A1
公开(公告)日:2016-01-28
The present disclosure provides compositions and methods for selectively killing senescent cells, wherein the composition comprises piperlongumine (PL) or derivative thereof. The selective killing of senescent cells may delay aging and/or treat age-related disorders.
Exploiting the Facile Release of Trifluoroacetate for the α-Methylenation of the Sterically Hindered Carbonyl Groups on (+)-Sclareolide and (−)-Eburnamonine
作者:Mark V. Riofski、Jinu P. John、Mary M. Zheng、Julia Kirshner、David A. Colby
DOI:10.1021/jo102114f
日期:2011.5.20
applied this method to produce semisynthetic derivatives of the natural products (+)-sclareolide and (−)-eburnamonine, in which the carbonylgroup is proximal to bulky functional groups. Mechanistic insight is also provided from a time course of 19F NMR. Biological evaluation of the natural-product-derived enones led to the identification of a derivative of (−)-eburnamonine with significant cytotoxicity
报道了一种用于羰基的α-甲基化的有效方法,并且该转化通过在烯烃形成过程中容易地消除三氟乙酸盐来完成。该方法代表了在空间障碍情况下对现有方案的改进,并且我们已经证明了该方法在一系列酮,内酰胺和内酯中的实用性。此外,我们已经应用此方法生产了天然产物(+)-香紫苏内酯和(-)-金枪鱼碱的半合成衍生物,其中羰基基团靠近庞大的官能团。还提供19分钟的时间过程的机械洞察力1 H NMR。对天然产物衍生的烯酮的生物学评估导致鉴定出在耐药MDA-MB-231乳腺癌细胞中具有显着细胞毒性(LC 50 = 14.12μM)的(-)-氨丁胺衍生物。
COMPOSITIONS AND PROCESSES OF PREPARING AND USING THE SAME
申请人:Colby David A.
公开号:US20140039182A1
公开(公告)日:2014-02-06
The present invention relates to compositions, for example, the DBU/Hexafluoroacetone hydrate salt, and processes of preparing and using the same for the modification of chemical compounds via the release of trifluoroacetate. The DBU/Hexafluoroacetone hydrate salt can perform trifluoromethylation reactions on chemical compounds, such as carbonyl group-containing compounds.
Hydrotrifluoroacetylation of Alkenes via Designer Masked Acyl Reagents
作者:Sangil Han、Kyra L. Samony、Rifat N. Nabi、Campbell A. Bache、Daniel K. Kim
DOI:10.1021/jacs.3c04294
日期:2023.5.31
functionality into organic compounds has become an important and growing research area. Although various protocols have been developed to access trifluoroketones, the use of trifluoroacetyl radicals remains virtually undeveloped. Herein, we disclose a novel method for trifluoroacetylation through an umpolung reagent, thereby transforming an electrophilicradical into a nucleophilic radical. The applicability