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。
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。
Long Hydrocarbon Chain Ether Diols and Ether Diacids That Favorably Alter Lipid Disorders in Vivo
作者:Ralf Mueller、Jing Yang、Caiming Duan、Emil Pop、Lian Hao Zhang、Tian-Bao Huang、Anna Denisenko、Olga V. Denisko、Daniela C. Oniciu、Charles L. Bisgaier、Michael E. Pape、Catherine Delaney Freiman、Brian Goetz、Clay T. Cramer、Krista L. Hopson、Jean-Louis H. Dasseux
DOI:10.1021/jm0400395
日期:2004.10.1
Long hydrocarbon chain ethers with bis-terminal hydroxyl or carboxyl groups have been synthesized and evaluated for their potential to favorably alter lipid disorders including metabolic syndrome. Compounds were assessed for their effects on the de novo incorporation of radiolabeled acetate into lipids in primary cultures of rat hepatocytes as well as for their effects on lipid and glycemic variables in female obese Zucker fatty rats following 1 and 2 weeks of daily oral administration. The most active compounds were found to be symmetrical with four to five methylene groups separating the central ether functionality and the gem dimethyl or methyl/aryl substituents. Biological activity was found to be greatest for tetramethyl-substituted ether diols (e.g., 28 and 31), while bis(arylmethyl) derivatives (e.g., 10, 11, and 27), diethers (e.g., 49, 50, and 56), and diphenyl ethers (e.g., 35 and 36) were the least active. For the most biologically active compound 28, we observed as much as a 346% increase in serum HDL-cholesterol and a 71% reduction in serum triglycerides at the highest dose administered (100 mg/kg) after 2 weeks of treatment. For compound 31 we observed a 69% reduction in non-HDL-cholesterol, accompanied by a 131% increase in HDL-cholesterol and an 84% reduction in serum triglycerides under the same treatment conditions.
Rh-Catalyzed Enantioselective Desymmetric Hydrogenation of α-Acetamido-1,3-indanediones Using Ether-Bridged Biphenyl Diphosphine Ligands
Novel axiallychiralbiphenyl diphosphine ligands Enm-BridgePhos, bearing an ether chain bridge at the 5,5′-position of the biphenyl backbone, have been developed and successfully applied in the Rh-catalyzed enantioselective desymmetric hydrogenation of α-acetamido-1,3-indanediones, providing chiral α-acetamido-β-hydroxybenzocyclic pentones in high yields (up to 97%) and with excellent enantioselectivities
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。