Suzuki–Miyaura Coupling of Simple Ketones via Activation of Unstrained Carbon–Carbon Bonds
作者:Ying Xia、Jianchun Wang、Guangbin Dong
DOI:10.1021/jacs.8b02462
日期:2018.4.25
Here, we describe that simple ketones can be efficiently employed as electrophiles in Suzuki-Miyauracoupling reactions via catalytic activation of unstrained C-C bonds. A range of common ketones, such as cyclopentanones, acetophenones, acetone and 1-indanones, could be directly coupled with various arylboronates in high site-selectivity, which offers a distinct entry to more functionalized aromatic
在这里,我们描述了通过催化激活无张力的 CC 键,简单的酮可以在 Suzuki-Miyaura 偶联反应中有效地用作亲电子试剂。一系列常见的酮,如环戊酮、苯乙酮、丙酮和1-茚满酮,可以直接与各种芳基硼酸酯以高位点选择性偶联,这为获得更多功能化的芳香酮提供了独特的途径。初步机理研究表明酮 α-CC 键通过氧化加成断裂。
THE DIPHENYLBORYL HEXACHLOROANTIMONATE PROMOTED FRIEDEL–CRAFTS ACYLATION REACTION
In the presence of a catalytic amount of diphenylboryl hexachloroantimonate(Ph2BSbCl6), acid chlorides or acid anhydrides react smoothly with aromatic compounds such as anisole and veratrole to give the corresponding aromatic ketones in good yields under mild conditions. Diphenylboryl hexachloroantimonate also activates acyl enolates in the Friedel–Crafts acylation reaction to give the aromatic ketones in good yields under almost neutral conditions.
The catalytic Friedel-Crafts acylation reaction and the catalytic Beckmann rearrangement are successfully carried out by using the active cationic species dichlorogallium(III) perchlorate and tetrachloroantimonium(V) hexafluoroantimonate(V), respectively, which were generated in situ from appropriate silver, gallium(III) or antimony(V) salts.
An Efficient Catalytic Friedel-Crafts Acylation Reaction of Equimolar Amounts of Aromatic Compounds and Free Carboxylic Acids or Their Trimethylsilylesters via Mixed Anhydrides
作者:Teruaki Mukaiyama、Kaoru Suzuki
DOI:10.1246/cl.1992.1751
日期:1992.9
In the presence of an active catalyst generated from SiCl4 and AgClO4, the Friedel-Crafts acylation reaction between equimolar amounts of aromatic compounds and mixed anhydrides, formed in situ from free carboxylic acids (or their trimethylsilylesters) and p-trifluoromethylbenzoic anhydride, smoothly proceeds at room temperature to afford the corresponding aromatic ketones in high yields.