Synthesis of 5-Nitro-2-furancarbohydrazides and Their cis-Diamminedichloroplatinum Complexes as Bitopic and Irreversible Human Thioredoxin Reductase Inhibitors
摘要:
The human selenoprotein thioredoxin reductase is involved in antioxidant defense and DNA synthesis. As increased thioredoxin reductase levels are associated with drug sensitivity to cisplatin and drug resistance in tumor cells, this enzyme represents a promising target for the development of cytostatic agents. To optimize the potential of the widely used cisplatin to inhibit the human thioredoxin reductase and therefore to overcome cisplatin resistance, we developed and synthesized four cis-diamminedichloroplatinum complexes of the lead 5-nitro-2-furan-carbohydrazide 8 selected from high-throughput screening. Detailed kinetics revealed that the isolated fragments, 5-nitro-2-furancarbohydrazide and cisplatin itself, bind with micromolar affinities at two different subsites of the human enzyme. By tethering both fragments four nitrofuran-based cis-diamminedichloroplatinum complexes 13a-c and 20 were synthesized and identified as biligand irreversible inhibitors of the human enzyme with nanomolar affinities. Studies with mutant enzymes clearly demonstrate the penultimate selenocysteine residue as the prime target of the synthesized cis-diamminedichloroplatinum complexes.
SURFACE ENHANCED RAMAN SPECTROSCOPY (SERS) COMPOUNDS AND METHODS OF THEIR PREPARATION
申请人:CHANG Young-Tae
公开号:US20120128592A1
公开(公告)日:2012-05-24
A compound for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) and a method of forming the compound is provided. The compound has Formula I:
wherein W is selected from the group consisting of an optionally substituted aryl group and an optionally substituted heteroaryl group; each Y independently is NR
1
R
2
, wherein R
1
and R
2
are independently selected from the group consisting of H and C
1
-C
6
alkyl, or R
1
and R
2
combine to form together with the nitrogen to which they are attached a heterocyclic group with 4 to 5 carbon atoms,
is used to denote a single or a double bond, and Z is NH, NH
2
, NH—(C═O)—(CH
2
)
n
—SH, wherein n=1 to 10, or
or a tautomer or stereoisomer thereof, or a salt thereof. A method and device for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) is also provided.
Intermolecular Dearomatization of Naphthalene Derivatives by Photoredox‐Catalyzed 1,2‐Hydroalkylation
作者:Yuan‐Zheng Cheng、Xu‐Lun Huang、Wei‐Hui Zhuang、Qing‐Ru Zhao、Xiao Zhang、Tian‐Sheng Mei、Shu‐Li You
DOI:10.1002/anie.202008358
日期:2020.10.5
visible‐light photoredoxcatalysis. With an organic photocatalyst, a series of multi‐substituted 1,2‐dihydronaphthalenes are obtained in good‐to‐excellent yields. Intriguingly, by tuning the substituents at the C2 position of naphthalenes, formal dearomative [3+2] cycloadditions occur exclusively via a hydroalkylative dearomatization–cyclization sequence. This overall redox‐neutral method features mild
[EN] RED-SHIFTED LUCIFERINS AND METHODS OF USING SAME<br/>[FR] LUCIFÉRINES À ÉMISSION DÉCALÉE VERS LE ROUGE ET LEURS PROCÉDÉS D'UTILISATION
申请人:PROMEGA CORP
公开号:WO2014159044A1
公开(公告)日:2014-10-02
Novel red-shifted luciferin derivatives and uses of those compounds are provided.
提供了新型红移发光素衍生物及其化合物的用途。
RED-SHIFTED LUCIFERINS AND METHODS OF USING SAME
申请人:PROMEGA CORPORATION
公开号:US20140304842A1
公开(公告)日:2014-10-09
Novel red-shifted luciferin derivatives and uses of those compounds are provided.
本发明提供了新的红移荧光素衍生物以及这些化合物的用途。
Surface Enhanced Raman Spectroscopy (SERS) compounds and methods of their preparation
申请人:Chang Young-Tae
公开号:US09006458B2
公开(公告)日:2015-04-14
A compound for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) and a method of forming the compound is provided. The compound has Formula I:
wherein W is selected from the group consisting of an optionally substituted aryl group and an optionally substituted heteroaryl group; each Y independently is NR1R2, wherein R1 and R2 are independently selected from the group consisting of H and C1-C6 alkyl, or R1 and R2 combine to form together with the nitrogen to which they are attached a heterocyclic group with 4 to 5 carbon atoms, is used to denote a single or a double bond, and Z is NH, NH2, NH—(C═O)—(CH2)n—SH, wherein n=1 to 10, or
or a tautomer or stereoisomer thereof, or a salt thereof. A method and device for detecting an analyte using Surface Enhanced Raman Spectroscopy (SERS) is also provided.