Synthesis and Characterization of 3-Arylquinazolinone and 3-Arylquinazolinethione Derivatives as Selective Estrogen Receptor Beta Modulators
摘要:
On the basis of the stucture of genistein, a new series of 3-arylquinazolines was prepared and tested for their estrogen receptor (ER) alpha and beta affinities. 5,7-Dihydroxy-3 -(4-hydroxyphenyl)-4(3H)-quinazolinone (1aa) acts as an agonist on both ER subtypes. It has 62-fold higher binding affinity [IC50(ER beta) = 179 nM] and 38-fold higher functional potency in a transcription assay [EC50(ER beta) = 76 nM] with ER beta than with ER alpha, thus improving upon the selectivity of genistein. All of the analogues showed preferential binding affinity for ER. Many are also more potent in activating transcription by ER beta than by ER alpha. Transformation of the C=O functionality at position 4 into a C=S group provided 5,7-dihydroxy-3-(4-hydroxyphenyl)4(3H)-quinazolinethione (1ba), which acts as an agonist on both ER subtypes but has 56-fold higher binding affinity for ER beta over ER alpha [IC50(ER beta) = 47 nM] and 215-fold higher potency in the transcription assay [EC50(ER beta) = 13 nM]. These ER beta-selective compounds may represent valuable tools in understanding the differences in structure and biological function of ER beta and ER alpha.
Primaryamines are prepared by the electrophilic amination of Grignardreagents with 4,4,5,5-tetramethyl-1,3-dioxolan-2-one O-phenylsulfonyloxime and the acidic hydrolysis of the resulting imines. [reaction: see text]
Disclosed are dipyridyl-pyrrole derivative compounds and analogs thereof, pharmaceutical compositions comprising such compounds and processes for preparing the same. The compounds are useful in the treatment of diseases amenable to protein kinase signal transduction inhibition, regulation and/or modulation.
QSAR modeling of synthesized 3-(1,3-benzothiazol-2-yl) 2-phenyl quinazolin-4(3H)-ones as potent antibacterial agents
作者:Pratibha Sharma、Ashok Kumar、Prerna Kumari、Jitendra Singh、M. P. Kaushik
DOI:10.1007/s00044-011-9626-0
日期:2012.7
on the basis of IR, 1H NMR, Mass, and elemental analysis data. These compounds were screened in vitro for their antibacterial activity against a representative panel of Gram positive and Gram negative bacteria and models were generated through quantitativestructure–activityrelationship (QSAR).The activity contributions due to structural and substituent effects were determined using sequential regression
目前的通讯引发了作为潜在抗菌剂的3-(1,3-苯并噻唑-2-基)2-苯基喹唑啉-4(3 H)-one的设计和合成。[( -一个数字取代的2-苯并噻唑氨基的,2-氨基-5- ë) -苯基二氮烯基]苯甲酸,和2-苯基-4- ħ恶嗪-4-酮合成为苯并[d] [1,3]前体基板。这些化合物以极高的收率合成,并且根据IR,1证实了结构1 H NMR,质量和元素分析数据。体外筛选了这些化合物对革兰氏阳性和革兰氏阴性细菌代表菌群的抗菌活性,并通过定量结构-活性关系(QSAR)建立了模型,并使用顺序回归程序确定了由于结构和取代作用而引起的活性贡献。抗菌测定数据表明,发现合成的化合物表现出深远的抗菌活性。
Enantioselective Deaminative Alkylation of Amino Acid Derivatives with Unactivated Olefins
sterically encumbered bis(oxazoline) ligand backbone, thus offering a de novo technology for accessing enantioenriched sp3–sp3 linkages via sp3 C–N functionalization. Our protocol is distinguished by its broad scope and generality across a wide number of counterparts, even in the context of late-stage functionalization. In addition, an enantioselective deaminative remote hydroalkylation reaction of unactivated
The Ortho Effect on the Acidic and Alkaline Hydrolysis of Substituted Formanilides
作者:Salil Dileep Desai、Lee E. Kirsch
DOI:10.1002/kin.20925
日期:2015.8
kinetics of formanilides hydrolysis were determined under first‐order conditions in hydrochloric acid (0.01–8 M, 20–60°C) and in hydroxide solutions (0.01–3 M, 25 and 40°C). Under acidic conditions, second‐order specific acid catalytic constants were used to construct Hammett plots. The orthoeffect was analyzed using the Fujita–Nishioka method. In alkaline solutions, hydrolysis displayed both first‐
在一级条件下,在盐酸(0.01–8 M,20–60°C)和氢氧化物溶液(0.01–3 M,25和40°C)中测定了甲虫胺水解的动力学。在酸性条件下,使用二阶特定酸催化常数构建哈米特图。的邻使用藤田-西冈方法进行分析的效果。在碱性溶液中,水解显示出氢氧化物浓度的一阶和二阶依赖性。特定的基本催化常数用于构建Hammett图。评估了邻位效应对氢氧化物浓度的一级依赖性。甲酰苯胺通过特定的酸催化在酸性溶液中水解,动力学研究结果与A AC一致2机制。邻位取代由于共振的空间抑制,由于空间体积的阻滞以及空间相互作用而导致反应速率降低。碱性溶液中的主要水解途径与修饰的B AC 2机理一致。在0.10 M氢氧化钠溶液中,间位和对位取代的甲虫胺水解的哈米特图没有显示出取代基效应。然而,邻位取代导致速率常数的降低与取代基的空间体积成正比。