Synthesis and Anti-bacterial Properties of Mono-carbonyl Analogues of Curcumin
作者:Guang Liang、Shulin Yang、Lijuan Jiang、Yu Zhao、Lili Shao、Jian Xiao、Faqing Ye、Yueru Li、Xiaokun Li
DOI:10.1248/cpb.56.162
日期:——
The synthesis of three series of curcumin analogues with mono-carbonyl is described. Their in vitro anti-bacterial activities against seven Gram-positive and Gram-negative bacteria were tested and the effect of substituents on the aryl ring and the space structure of the linking strain were discussed. It was observed that part of the derivatives displayed significant activity when compared with curcumin and most of them exhibited activity against the ampicillin-resisted Enterobacter cloacae. Compounds A12, B09, B13, B14 and C09 show remarkable antibacterial activity in vitro. The result showed that heterocycle or long-chain substituents may enhance the activity of curcumin analogues.
New spiro (thio) barbiturates based on cyclohexanone and bicyclo [3.1.1]heptan-6-one by nonconcerted [1+5] cycloaddition reaction and their conformational structures
作者:N. N. Pesyan、S. Noori、S. Poorhassan、E. Şahin
DOI:10.4314/bcse.v28i3.12
日期:——
Crossed-aldol condensation reaction of aromaticaldehydes with ketones such as; acetone and cyclohexanone leads to the efficient formation of cross conjugated α,β-unsaturated ketones in excellent yield. The intermolecular and then intramolecular Michael addition reaction of α,β-unsaturated ketones derived from acetone and cyclohexanone with (thio)barbituric acids lead to synthesis new type of 7,11-diaryl-2
芳族醛与酮的交联醇醛缩合反应,如:丙酮和环己酮可有效地形成交叉共轭的α,β-不饱和酮,且产率极高。丙酮和环己酮衍生的α,β-不饱和酮与(硫代)巴比妥酸的分子内和分子内迈克尔加成反应导致合成新型的7,11-二芳基-2,4-二氮杂螺[5.5]十一烷-1, 3,5,9-丁酮和2,4-二芳基-1'H-螺[双环[3.3.1]壬烷-3,5'-嘧啶] -2',4',6',9(3'H )-四酮,分别具有良好的收率。通过1 H NMR,13 C NMR,FT-IR,UV-Visible,质谱和X射线晶体学技术进行结构阐明。讨论了一种可能的形成机理。结构构象还由邻近质子和双子质子之间的二面角衍生的耦合常数证明。来自巴比妥酸的螺环化合物的NH质子的1 H NMR光谱显示宽的单峰,而源自硫代巴比妥酸的螺环化合物中的这些质子显示两个不同的峰。关键词:交叉羟醛缩合,迈克尔加成,[1 + 5]环加成,巴比妥酸,构象,螺环巴比妥酸盐。化学
A Straightforward Synthesis and Structure–Activity Relationship of Highly Efficient Initiators for Two-Photon Polymerization
practical two-photon absorption photoinitiators (TPA PIs) has been slow due to their complicated syntheses often reliant on expensive catalysts. These shortcomings have been a critical obstruction for further advances in the promising field of two-photon-induced photopolymerization (TPIP) technology. This paper describes a series of linear and cyclic benzylidene ketone-basedtwo-photoninitiators containing
实用的双光子吸收光引发剂(TPA PI)的开发因其复杂的合成过程(通常依赖于昂贵的催化剂)而进展缓慢。这些缺点对于在有前景的双光子诱导的光致聚合(TPIP)技术领域的进一步发展已成为关键的障碍。本文描述了一系列的线性和环状的亚苄基酮基双光子引发剂,这些引发剂通过经典的醇醛缩合反应一步合成,包含双键和二烷基氨基。通过量子化学计算和实验测试对结构-活性关系进行了系统研究。这些结果表明,中心环的大小显着影响激发态的能量学和发射量子产率以及双光子引发效率。在TPIP测试中,基于4-甲基环己酮的引发剂比具有中央五元环和先前描述的高活性TPA PI的引发剂显示出更宽的理想加工窗口。出人意料的是,使用基于丙烯酸酯的配方对复杂的3D结构进行微加工时,写入速度高达80 mm / s。这些高活性的TPA PI也表现出出色的热稳定性,并且对单光子激发保持惰性。直接合成与高TPA引发效率相结合,使这些新型引发剂有
A Convenient Synthesis of α,α′-Bis(substituted benzylidene)cycloalkanones Catalyzed by Yb(OTf)<sub>3</sub>Under Solvent-Free Conditions
aromatic aldehydes undergoes crossed aldol condensation with ketones in the presence of a catalytic amount of Yb(OTf) 3 under solvent-free conditions to afford the corresponding α,α'-bis(substitutedbenzylidene)cycloalkanones in excellent yields without occurrence of any side reactions. This method is very general, simple and environmental friendly in contrast with the existing methods, which use many
Abstract Bromodimethylsulfonium bromide (BDMS)–catalyzed crossed aldol condensation between aromatic aldehydes and ketones is reported to access α,α′-bis(arylmethylidene) cycloalkanones at room temperature in good yields within 3–10 min. The salient features of this method are the simplicity of the procedure, the ready accessibility of the catalyst, and greater yields in relatively short reaction times