SpinPhox/Iridium(I)-Catalyzed Asymmetric Hydrogenation of Cyclic α-Alkylidene Carbonyl Compounds
作者:Xu Liu、Zhaobin Han、Zheng Wang、Kuiling Ding
DOI:10.1002/anie.201309521
日期:2014.2.10
cyclic carbonyl compounds bearing an α‐chiral carbon center are of interest in pharmaceutical sciences and asymmetric synthesis. Herein, SpinPhox/IrI catalysts have been demonstrated to be highly enantioselective in the asymmetric hydrogenation of the CC bonds in the exocyclicα,β‐unsaturated cyclic carbonyls, including a broad range of α‐alkylidene lactams, unsaturated cyclic ketones, and lactones. It
带有α-手性碳中心的旋光中型环状羰基化合物在制药科学和不对称合成中引起人们的兴趣。在本文中,SpinPhox / Ir I催化剂在环外α,β-不饱和环状羰基化合物(包括各种α-亚烷基内酰胺,不饱和环状酮)中的CC键的不对称氢化中被证明具有高度对映选择性。内酯。值得注意的是,该方法可以成功地用于具有六元或七元环的具有挑战性的α-烷基亚内酰胺底物的不对称氢化,从而提供相应的具有α-手性碳中心的旋光羰基化合物,其对映体过量通常非常好(高达ee的98% )。该协议的合成用途还已在抗炎药洛索洛芬及其类似物以及生物学上重要的ε-氨基己酸衍生物的不对称合成中得到证明。
Natural α-methylenelactam analogues: Design, synthesis and evaluation of α-alkenyl-γ and δ-lactams as potential antifungal agents against Colletotrichum orbiculare
In our continued efforts to improve the potential utility of the alpha-methylene-gamma-lactone scaffold, 62 new and 59 known natural alpha-methylenelactam analogues including alpha-methylene-gamma- lactams, alpha-arylidene- gamma and delta-lactams, and 3-arylideneindolin-2-ones were synthesized as the bioisosteric analogues of the amethylenelactone scaffold. The results of antifungal and cytotoxic activity indicated that among these derivatives compound (E)-1-(2, 6-dichlorobenzyl)-3-(2-fluorobenzylidene) pyrrolidin-2-one (Py51) possessed good selectivity with the highest antifungal activity against Colletotrichum orbiculare with IC50 - 10.4 mu M but less cytotoxic activity with IC50 - 141.2 mu M (against HepG2 cell line) and 161.2 mu M ( against human hepatic L02 cell line). Ultrastructural change studies performed by transmission electron microscope showed that Py51 could cause important cell morphological changes in C. orbiculare, such as plasma membrane detached from cell wall, cell wall thickening, mitochondria disruption, a dramatic increase in vacuolation, and eventually a complete loss in the integrity of organelles. Significantly, mitochondria appeared one of the primary targets, as confirmed by their remarkably aberrant morphological changes. Analysis of structureeactivity relationships revealed that incorporation of the aryl group into the alpha-exo methylene and the N-benzyl substitution increased the activity. Meanwhile, the alpha-arylidene-gamma-lactams have superiority in selectivity over the 3-arylideneindolin-2-ones. Based on the results, the N- benzyl substituted a-(2-fluorophenyl)-gamma-lactam was identified as the most promising natural- based scaffold for further discovering and developing improved crop- protection agents. (c) 2017 Elsevier Masson SAS. All rights reserved.
Olefination of 3-diazopiperidin-2-one
作者:Richard Harrison、Antonio Mete、Lauren Wilson
DOI:10.1016/s0040-4039(03)01680-0
日期:2003.8
New conditions have been developed for the olefination of diazo compounds catalysed by methyl trioxorhenium. The new system is suitable for unreactive diazo compounds and its utility is demonstrated by the olefination of 3-diazopiperidin-2-one with a range of aromatic, heterocyclic and alkylaldehydes. (C) 2003 Elsevier Ltd. All rights reserved.
Design and synthesis of HDAC inhibitors to enhance the therapeutic effect of diffuse large B-cell lymphoma by improving metabolic stability and pharmacokinetic characteristics
Several HDAC inhibitors have been approved for cancer treatment to date, however, clinical applications have been limited due to the poor pharmacokinetics, bioavailability, selectivity of the HDAC inhibitors and most of them need to be combined with other drugs to achieve better results. Here, we describe our efforts toward the discovery of a novel series of lactam-based derivatives as selective HDAC
组蛋白去乙酰化酶 (HDAC) 是临床验证和有吸引力的人类癌症表观遗传药物靶点。迄今为止,有几种HDAC抑制剂已被批准用于癌症治疗,但由于HDAC抑制剂的药代动力学、生物利用度和选择性较差,临床应用受到限制,其中大多数需要与其他药物联合使用才能达到更好的效果。在这里,我们描述了我们为发现一系列新的内酰胺衍生物作为选择性 HDAC 抑制剂所做的努力。密集的结构修饰导致化合物24g被鉴定为最活跃的 I 类 HDAC 抑制剂,以及令人满意的体外代谢稳定性 (t 1/2, 人类 = 797 分钟) 和理想的口服生物利用度 (F = 92%)。更重要的是,化合物24g在TMD-8异种移植模型(TGI = 77%)中显示出良好的抗肿瘤功效,且无明显毒性。这些结果表明 I 类 HDAC 抑制剂可能潜在地用于治疗某些弥漫性大 B 细胞淋巴瘤疗法。