InBr
<sub>3</sub>
‐Catalyzed Coupling Reaction between Electron‐Deficient Alkenyl Ethers with Silyl Enolates for Stereoselective Synthesis of 1,5‐Dioxo‐alk‐2‐enes
InBr3 catalysis enables the coupling between 2‐carbonylalkenyl ethers and silyl enolates to give 1,5‐dioxo‐alk‐2‐enes featuring alkene moieties with perfect stereoselectivity. Various types of 2‐carbonylalkenyl ethers and silyl enolates are applicable to the present reaction. InBr3 with moderate Lewis acidity plays an important role in both the activation of alkenyl ethers and in the elimination of
Activity of Antifungal Organobismuth(III) Compounds Derived from Alkyl Aryl Ketones against S. cerevisiae: Comparison with a Heterocyclic Bismuth Scaffold Consisting of a Diphenyl Sulfone
A series of hypervalent organobismuth(III) compounds derivedfromalkylarylketones [XBi(5-R'C6H3-2-COR)(Ar)] was synthesized to investigate the effect of the compounds' structural features on their antifungal activity against the yeast Saccharomyces cerevisiae. In contrast to bismuth heterocycles [XBi(5-RC6H3-2-SO2C6H4-1'-)] derivedfrom diphenyl sulfones, a systematic quantitative structure-activity
合成了一系列衍生自烷基芳基酮 [XBi(5-R'C6H3-2-COR)(Ar)] 的高价有机铋 (III) 化合物,以研究这些化合物的结构特征对其抗酵母菌活性的影响酿酒酵母。与衍生自二苯砜的铋杂环 [XBi(5-RC6H3-2-SO2C6H4-1'-)] 相比,系统的定量构效关系研究是可能的。活性取决于 Ar 基团,对于较重的 X 原子会增加,而延长烷基链 (R) 或引入取代基 (R') 会降低活性。IBi(C6H4-2-COCH3)(4-FC6H4) 是最活跃的。其活性优于相关的无环类似物 ClBi[C6H4-2-CH2N(CH3)2](Ar) 和 ClBi(C6H4-2-SO2 tert-Bu)(Ar),也可与杂环 ClBi( C6H4-2-SO2C6H4-1'-),这是我们之前研究中最活跃的化合物。密度函数理论计算表明,高价铋烷与铋原子上的生物分子发生亲核加成,得到中间体 ate 络
Iron- and Bismuth-Catalyzed Asymmetric Mukaiyama Aldol Reactions in Aqueous Media
作者:Taku Kitanosono、Thierry Ollevier、Shū Kobayashi
DOI:10.1002/asia.201301149
日期:2013.12
asymmetric Mukaiyamaaldolreactions of silicon enolates with aldehydes catalyzed by chiral FeII and BiIII complexes. Although previous reactions often required relatively harsh conditions, such as strictly anhydrous conditions, very low temperatures (−78 °C), etc., the reactions reported herein proceeded in the presence of water at 0 °C. To find appropriate chiral water‐compatible Lewisacids for the
A simple, effective, new, palladium-catalyzed conversion of enol silanes to enones and enals
作者:Richard C. Larock、Timothy R. Hightower、George A. Kraus、Pat Hahn、Deye Zheng
DOI:10.1016/0040-4039(95)00306-w
日期:1995.4
Enol silanes derived from aldehydes and ketones are readily converted to the corresponding α,β-unsaturated carbonyl compounds by 10% Pd(OAc)2 in the presence of one atmosphere of oxygen in DMSO as the solvent.
Highly Stereoselective Oxazaborolidinium Ion Catalyzed Synthesis of (<i>Z</i>)-Silyl Enol Ethers from Alkyl Aryl Ketones and Trimethylsilyldiazomethane
作者:Byung Chul Kang、Su Yong Shim、Do Hyun Ryu
DOI:10.1021/ol500174q
日期:2014.4.18
Highly stereoselective (Z)-silyl enol ethers were prepared fromalkylarylketones and trimethylsilyldiazomethane (TMSD) using an oxazaborolidinium ion catalyst. In addition, ring-expanded silyl enol ethers were successfully constructed from cyclic ketones. Their synthetic utilities were shown by sequential Mukaiyama aldol and [2 + 2]-cycloaddition reactions.