Phenolic Bis-styrylbenzenes as β-Amyloid Binding Ligands and Free Radical Scavengers
摘要:
Starting from bisphenolic bis-styrylbenzene DF-9 (4), P-amyloid (A beta) binding affinity and specificity for phenolic bis-styrylbenzenes, monostyrylbenzenes, and alkyne controls were determined by fluorescence titration with beta-amyloid peptide A beta(1-40) and a fluorescence assay using APP/PSI transgenic mouse brain sections. Bis-styrylbenzene SA R is derived largely from work on symmetrical compounds. This study is the first to describe A beta binding data for bis-styrylbenzenes unsymmetrical in the outer rings. With one exception, binding affinity and specificity were decreased by adding and/or changing the substitution pattern of phenol functional groups, changing the orientation about the central phenyl ring, replacing the alkene with alkyne bonds, or eliminating the central phenyl ring. The only compound with an A beta binding affinity and specificity comparable to 4 was its 3-hydroxy regioisomer 8. Like 4, 8 crossed the blood brain barrier and bound to A beta plaques in vivo. By use of a DPPH assay, phenol functional groups with papa orientations seem to be a necessary. but insufficient, criterion for good free radical scavenging properties in these compounds.
Palladium-catalyzed iminocarbonylative cross-coupling reaction between haloarenes, t-BuNC, and 9-alkyl-9-BBN derivatives. Synthesis of alkyl aryl ketones
derivatives, t-butylisocyanide, and haloarenes was carried out in dioxane at 50°C in the presence of K3PO4 and a catalytic amount of Pd(PPh3)4. The reaction provides alkyl aryl ketones in high yields after hydrolysis of the ketimine intermediates.
9-烷基-9-BBN衍生物,叔丁基异氰化物和卤代芳烃之间的交叉偶联反应是在二恶烷中于50°C在K 3 PO 4和催化量的Pd(PPh 3)4存在下进行的。酮亚胺中间体水解后,该反应以高收率提供烷基芳基酮。
[EN] BORON-CONTAINING SMALL MOLECULES<br/>[FR] PETITES MOLÉCULES CONTENANT DU BORE
申请人:ANACOR PHARMACEUTICALS INC
公开号:WO2017151489A1
公开(公告)日:2017-09-08
Compounds, pharmaceutical formulations, and methods of treating bacterial infections are disclosed.
化合物、药物配方和治疗细菌感染的方法被披露。
Copper‐Photocatalyzed Borylation of Organic Halides under Batch and Continuous‐Flow Conditions
The copper‐photocatalyzed borylation of aryl, heteroaryl, vinyl and alkyl halides (I and Br) was reported. The reaction proceeded using a new heteroleptic Cu complex under irradiation with blue LEDs, giving the corresponding boronic‐acid esters in good to excellent yields. The reaction was extended to continuous‐flow conditions to allow an easy scale‐up. The mechanism of the reaction was studied and
据报道,铜光催化的芳基,杂芳基,乙烯基和烷基卤化物(I和Br)的硼化反应。该反应在蓝色LED的照射下使用一种新型的杂铜配合物进行,从而得到了相应的硼酸酯,收率良好至极佳。反应扩展到连续流动条件,以易于放大。研究了该反应的机理,并提出了基于还原淬灭(Cu I / Cu I * / Cu 0)的机理。
Nyasol and Analogs Thereof for the Treatment of Estrogen Receptor Beta-Mediated Diseases
申请人:Cohen Isaac
公开号:US20090312274A1
公开(公告)日:2009-12-17
Estrogenic compositions comprising nyasol and analogs thereof are provided. Also provided are methods of using said extracts to achieve an estrogenic effect, especially in a human, e.g. a female human. In some embodiments, the methods include treatment of climacteric symptoms. In some embodiments, the methods include treatment of estrogen receptor positive cancer, such as estrogen responsive breast cancer. In some embodiments, the methods include treatment or prevention of osteoporosis.
Total Synthesis of the Biphenyl Alkaloid (−)‐Lythranidine
作者:Konrad Gebauer、Alois Fürstner
DOI:10.1002/anie.201402550
日期:2014.6.16
Lythraceum alkaloid lythanidine in a few high‐yielding steps. This application attests to the excellent functional‐group tolerance of a molybdenum alkylidyne complex endowed with triphenylsilanolate ligands, which enabled the macrocyclization even in the presence of protic functionalities, and thus illustrates the power of contemporary catalytic acetylene chemistry for target‐oriented synthesis.