Synthesis and Quantitative Structure–Activity Relationship of Imidazotetrazine Prodrugs with Activity Independent of O6-Methylguanine-DNA-methyltransferase, DNA Mismatch Repair, and p53
摘要:
The antitumor prodrug temozolomide is compromised by its dependence for activity on DNA mismatch repair (MMR) and the repair of the chemosensitive DNA lesion, O6-methylguanine (O6-MeG), by O6-methylguanine-DNA-methyltransferase (E.C. 2.1.1.63, MGMT). Tumor response is also dependent on wild-type p53. Novel 3-(2-anilinoethyl)-substituted imidazotetrazines are reported that have activity independent of MGMT, MMR, and p53. This is achieved through a switch of mechanism so that bioactivity derives from imidazotetrazine-generated arylaziridinium ions that principally modify guanine-N7 sites on DNA. Mono- and bifunctional analogues are reported, and a quantitative structure-activity relationship (QSAR) study identified the p-tolyl-substituted bifunctional congener as optimized for potency, MGMT-independence, and MMR-independence. NCI60 data show the tumor cell response is distinct from other imidazotetrazines and DNA-guanine-N7 active agents such as nitrogen mustards and cisplatin. The new imidazotetrazine compounds are promising agents for further development, and their improved in vitro activity validates the principles on which they were designed.
Niacin Receptor Agonists, Compositions Containing Such Compounds and Methods of Treatment
申请人:Raghavan Subharekha
公开号:US20090062269A1
公开(公告)日:2009-03-05
The present invention encompasses compounds of Formula I: as well as pharmaceutically acceptable salts and hydrates thereof, that are useful for treating atherosclerosis, dyslipidemias and the like. Pharmaceutical compositions and methods of use are also included.
Cu(acac)2 Immobilized in Ionic Liquids: A Recoverable and Reusable Catalytic System for Aza-Michael Reactions
作者:M. Lakshmi Kantam、V. Neeraja、B. Kavita、B. Neelima、Mihir K. Chaudhuri、Sahid Hussain
DOI:10.1002/adsc.200404361
日期:2005.5
Copper(II) acetylacetonate immobilized in ionicliquids efficiently catalyzes the aza-Michaelreaction of amines with α,β-unsaturated carbonyl compounds to produce the corresponding β-amino carbonyl compounds with great alacrity in excellent yields. The reactions are far more facile than those reported earlier. The recoveredionicliquid phase containing the copper catalyst can be reused for several cycles
An Efficient ZrCl4 Catalyzed Aza-Michael Addition Reaction: Synthesis of C-Linked Carbo β3-Amino Acids
作者:Krishna Damera、Katta Reddy、Gangavaram Sharma
DOI:10.2174/157017809787582834
日期:2009.3.1
A mild aza-Michael protocol has been developed using ZrCl4 as catalyst on α, β-unsaturated esters and nitriles. The aromatic amines were found to give the products with ease. The ZrCl4 mediated route was compatible with acid sensitive carbohydrate esters and provided an efficient method to prepare C-linked carbo β3-amino acids (β3-Caa).
Study on a series of water-soluble photoinitiators for fabrication of 3D hydrogels by two-photon polymerization
作者:Xing Huang、Xiaopu Wang、Yuxia Zhao
DOI:10.1016/j.dyepig.2017.02.040
日期:2017.6
using UV–Vis spectra, fluorescence spectra and two-photon absorptionspectra. The maximum two-photon absorption cross-sections (σ2) of T1-T3 in deionized water were determined as 567 GM, 808 GM and 231 GM. Using T1-T3 as photoinitiators (PIs) directly, 2D and 3D nano patterns based on two-photon crosslinking or polymerization of bovine serum albumin (BSA), water-soluble acrylicester monomer (SR610)
Highly sensitive and selective chemosensors for Cu<sup>2+</sup>and Al<sup>3+</sup>based on photoinduced electron transfer (PET) mechanism
作者:Santosh Chemate、Nagaiyan Sekar
DOI:10.1039/c5ra00123d
日期:——
Two new fluorescent PET chemosensors were synthesised from an acridine core. The sensors can be used to monitor Cu2+and Al3+in CH3CN. The detection limits for7a–Cu2+and7b–Al3+were calculated to be 2.8 × 10−7M and 5.8 × 10−7M, respectively.