aryl acyloin (α‐hydroxyketone) O‐alkyl and O‐phenyl derivatives with 2–3 equiv of Zn and 1–2 equiv of NH4Cl in ethanol, refluxing for 20–120 min, gave the corresponding ketones with excellent yields. Further, α,β‐epoxy ketones can be efficiently transformed to β‐hydroxy ketones, and 2,2‐dialkoxy‐1‐phenylketone also can be dealkoxylated to 1‐phenylketone.
A NEW METHOD FOR THE DIRECT INTRODUCTION OF ALKOXYL GROUP TO SILYL ENOL ETHER WITH ALKYL HYPOCHLORITE CATALYZED BY PALLADIUM(O)
作者:Takashi Nakatsuka、Teruaki Mukaiyama
DOI:10.1246/cl.1982.369
日期:1982.3.5
α-Alkoxyketones and α-ketoacetals are prepared in good yields from silylenolethers and alkyl hypochlorites catalyzed by tetrakis (triphenylphosphine)palladium(O).
First <i>anti</i>
-Selective Direct Michael Addition of α-Alkoxy Ketones to Enones by Cooperative Catalysis of Samarium(III) Trifluoromethanesulfonate and Tributyltin Methoxide
作者:Naoto Esumi、Yoshihiro Nishimoto、Makoto Yasuda
DOI:10.1002/ejoc.201700501
日期:2017.5.18
and Bu3SnOMe. The combination of these two catalysts effectively allowed the generation of enolate species from α-alkoxy ketones and produced Michael adducts in high yields with high anti diastereoselectivity. A variety of enones and α-alkoxy ketones were applied to this system to give the anti products. One-pot domino Michael/aldol reactions effectively afforded cyclic enones with a defined configuration
Ein neuer zugang zu substituierten 5,6,7,8-tetrafluorchinolinen
作者:H.J. Bader、G. Schütz、H. Wenck
DOI:10.1016/s0022-1139(00)81952-1
日期:1986.9
The reaction of 2,3,4,5,6-pentafluorochalcones in ammonium acetate/ glacial acetic acid yields 5,6,7,8-tetrafluoroquinolines. In addition 4-pentafluorophenyl-2,6-diphenylpyridines are formed.
Chromium-catalyzed transfer hydrogenation of aromatic aldehydes facilitated by a simple metal carbonyl complex
作者:Daniel Timelthaler、Christoph Topf
DOI:10.1016/j.jcat.2022.07.001
日期:2022.9
We communicate a simple method for the transferhydrogenation of aromatic aldehydes in i-PrOH effected by the cost-effective and easy-to-handle [Cr(CO)6]. The reactions are readily carried in Ar-flushed tubes without further need of special equipment. Functional groups are widely tolerated and, if desired, the catalytic transformations can be further promoted through the addition of trimethylamine
我们介绍了一种在i -PrOH中转移氢化芳香醛的简单方法,该方法受成本效益高且易于处理的 [Cr(CO) 6 ] 的影响。反应很容易在 Ar 冲洗管中进行,无需进一步的特殊设备。官能团具有广泛的耐受性,如果需要,可以通过添加三甲胺N-氧化物 (TMAO) 进一步促进催化转化。这为在温和反应条件下处理热不稳定底物铺平了道路。此外,所介绍的方法适用于苯甲醇衍生物的氘代。