苯基二苯并[去质子化B,F ] tropylidene(8)用LDA /吨-BuOK基葡萄糖接着用廉价的非对映体任一淬火吨-Bu-亚磺酸盐([R或( - )小号) - 11次,得到亚砜烯烃混合(S S ,S C)-9 /(S S ,R C)-10和(R S ,R C)-9 /(R S ,S C)-10的非对映体对分别通过色谱/重结晶可将其分离成四个异构体。光学纯的非对映体配体(S S ,S C)-9和(S S ,R C)-10与[RhCl(coe)2 ] 2反应形成双核络合物(R S ,S C)-11和(R S ,R C)-12,其中双齿配体通过硫和烯烃供体的功能配位金属中心。这些络合物以高达99%ee的对映选择性催化芳基硼酸与环状Michael受体的共轭加成。DFT计算显示了配体烯烃官能团的平面手性的主要影响。在(R S ,S C)-11和(R S ,R C)-12之间观察到的对映选择性
pH-Dependent conjugate addition of arylboronic acids to α,β-unsaturated enones catalyzed by a reusable palladium(II)/cationic 2,2′-bipyridyl system in water under air
作者:Shao-Hsien Huang、Tzu-Min Wu、Fu-Yu Tsai
DOI:10.1002/aoc.1654
日期:2010.9
A reusable Pd(NH3)2Cl2/cationic 2,2′‐bipyridyl system for the catalysis of the conjugateaddition of arylboronic acids to α,β‐unsaturated enones in water under air was developed. Addition of arylboronic acids to both cyclic and acyclic enones progressed smoothly, providing the products in good to high yields, the best result being obtained when HBF4 was used to adjust the pH value to 1.0. After the
Macrocyclic Ghrelin Receptor Antagonists and Inverse Agonists and Methods of Using the Same
申请人:Hoveyda Hamid R.
公开号:US20110105389A1
公开(公告)日:2011-05-05
The present invention provides novel conformationally-defined macrocyclic compounds that have been demonstrated to be selective modulators of the ghrelin receptor (GRLN, growth hormone secretagogue receptor, GHS-R1a and subtypes, isoforms and/or variants thereof). Methods of synthesizing the novel compounds are also described herein. These compounds are useful as antagonists or inverse agonists of the ghrelin receptor and as medicaments for treatment and prevention of a range of medical conditions including, but not limited to, metabolic and/or endocrine disorders, obesity and obesity-associated disorders, appetite or eating disorders, addictive disorders, cardiovascular disorders, gastrointestinal disorders, genetic disorders, hyperproliferative disorders, central nervous system disorders and inflammatory disorders.
Catalytic and Regioselective Ring Expansion of Arylcyclobutanones with Trimethylsilyldiazomethane. Ligand-Dependent Entry to β-Ketosilane or Enolsilane Adducts
作者:Jennifer A. Dabrowski、David C. Moebius、Andrew J. Wommack、Anne F. Kornahrens、Jason S. Kingsbury
DOI:10.1021/ol101136a
日期:2010.8.20
Divergent reactivity is uncovered in the homologation of arylcyclobutanones with trimethylsilyldiazomethane. With Sc(OTf)(3) as catalyst, enolsilanes are obtained with a high preference for methylene migration. By contrast, Sc(hfac)(3) gives beta-ketosilanes with both regio- and diastereocontrol. Each adduct affords the cyclopentanone upon hydrolysis.