新型轴向手性联苯二膦配体E n m -BridgePhos,在联苯主链的5,5′-位上带有醚链桥,已被开发并成功应用于Rh催化的α-acetamido-1的对映选择性不对称氢化反应,3-茚满二酮,以高产率(高达 97%)提供手性 α-乙酰氨基-β-羟基苯并环戊酮,并具有优异的对映选择性(高达 99% ee)。该反应可以在克级规模上进行,相应的产物可作为合成手性螺苄基异喹啉生物碱类似物的重要中间体。晶体结构分析和DFT计算均表明E nm -BridgePhos-Rh配合物的大二面角与优异的对映选择性密切相关。
研究了甲醇催化取代的亚苄基萘以及正和邻甲基邻苯基乙酰苯甲酸甲酯形成2-苯基茚满-1,3-二酮的重排的详细机理。在甲醇二甲基亚砜(DMSO)中反应的速率-酸度函数相关性显示速率随H _线性增加,在对硝基底物除外之前达到最大速率。该导数显示出在整个H _范围内速率降低。甲醇和94 mol%的DMSO中的ρ值分别为1.7和–1.6。在k H / k D下观察到了动力学同位素效应0.8-1.0。已经确定了邻苯基乙酰基苯甲酸甲酯的环链互变异构的平衡常数,并且该常数不依赖于取代基和溶剂组成。决定速率的步骤是正酸酯的阴离子在酯羰基上的分子内攻击。在甲醇和高甲醇含量的甲醇DMSO中,这之前是正酸酯的电离平衡。在低甲醇含量的甲醇DMSO中,对于对硝基底物,初始状态是阴离子本身。
Hypolipidemic activity of indan-1,3-dione derivatives in rodents
作者:A. R. Murthy、S. D. Wyrick、I. H. Hall
DOI:10.1021/jm00149a008
日期:1985.11
derivatives, were tested for hypolipidemicactivity of CF1 male mice at 20 mg/kg per day. These derivatives reduced both serum cholesterol and triglycerides after 16 days of administration intraperitoneally. 2-(4-Methoxyphenyl)indan-1,3-dione was one of the more active compounds with 41% reduction of serum cholesterol and 58% reduction of serum triglyceride levels on day 16. This activity was confirmed in the
[EN] INDANONE AND INDANDIONE DERIVATIVES AND HETEROCYCLIC ANALOGS<br/>[FR] DÉRIVÉS D'INDANONE ET D'INDANEDIONE ET ANALOGUES HÉTÉROCYCLIQUES
申请人:ACTELION PHARMACEUTICALS LTD
公开号:WO2013068785A1
公开(公告)日:2013-05-16
The invention relates to indanone/indandione derivatives and heterocyclic analogs of Formula (I) wherein Ar1, A, B, L1, Y, Z, and (R1)n n are as described in the description; to pharmaceutically acceptable salts thereof, and to the use of such compounds as medicaments, especially as NPS receptor antagonists.
The developments of hydrogensources stand at the forefront of asymmetric reduction. In contrast to the well-studied alcohols as hydrogensources via β-hydride elimination, the direct utilization of the proton of alcohols as a hydrogensource for activator-mediated asymmetric reduction is rarely explored. Herein we report the proton of alcohols as a hydrogensource in diboron-mediated palladium-catalyzed
quaternary stereocenter with high enantioselectivity and diastereoselectivity. Mechanistic studies and DFT calculations suggested that the rarely observed diastereoselectivity reversal is ascribed to the charge-charge interaction between the palladium and aromatic ring of the substrate, which could not only result in the reversal of the diastereoselectivity, but also improve the reactivity.
allowing selective access to tertiary alkylated ketones and alkenes. The present approach features commercially available starting materials, broad substrate scope, general functional-group (including halogen, ester, nitrile, thioether) tolerance. Furthermore, we proposed plausible pathways to rationalize the divergent selectivity through preliminary mechanism study.