Direct Route to 1,3-Diketones by Palladium-Catalyzed Carbonylative Coupling of Aryl Halides with Acetylacetone
作者:Signe Korsager、Dennis U. Nielsen、Rolf H. Taaning、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1002/chem.201303872
日期:2013.12.23
Man up your magnesium! By employing a MgCl2/Et3N system, aryl diketones can be generated from the Pd‐catalyzed carbonylative α‐arylation of acetylacetone with aryl bromides (see scheme). The method is ideal for the introduction of carbon isotopes into more complex structures, since only stoichiometric amounts of carbon monoxide are employed.
举起你的镁!通过使用MgCl 2 / Et 3 N系统,可以从Pd催化的乙酰丙酮与芳基溴的羰基化α-芳基化反应生成芳基二酮(请参见方案)。该方法非常适合将碳同位素引入更复杂的结构中,因为仅使用化学计量的一氧化碳。
I
<sub>2</sub>
‐Promoted [3+2] Cyclization of 1,3‐Diketones with Potassium Thiocyanate: a Route to Thiazol‐2(3
<i>H</i>
)‐One Derivatives
作者:Zhenyu An、Yafeng Liu、Pengbo Zhao、Rulong Yan
DOI:10.1002/adsc.202100228
日期:2021.7
An I2-promoted strategy has been developed for the synthesis of thiazol-2(3H)-onederivatives from 1,3-diketones with potassium thiocyanate. This [3+2] cyclization reaction involves C−S and C−N bond formation and exhibits good functional group tolerance. A series of thiazol-2(3H)-onederivatives are obtained in moderate to good yields.
已开发出一种 I 2促进策略,用于从 1,3-二酮与硫氰酸钾合成 thiazol-2(3 H )-one 衍生物。这种 [3+2] 环化反应涉及 C-S 和 CN 键的形成,并表现出良好的官能团耐受性。以中等至良好的产率获得了一系列 thiazol-2(3 H )-one 衍生物。
Iodine-Catalyzed Ring Opening of 1,1-Diacylcyclopropanes for Synthesis of Fully Substituted Pyrazole Derivatives
Iodine‐catalyzed ring opening of 1,1‐diacylcyclopropanes for synthesis of fully substituted pyrazole derivatives have been reported. This reaction tolerates a broad range of cyclopropyl ketones and sulfonyl hydrazides to afford useful and densely functionalized pyrazole derivatives with a hydroxy functional group.
Transition Metal-Free De Novo Synthesis of Sulfonated Pyrazoles from Sulfonyl Hydrazides, 1,3-Diketones, and Sodium Sulfinates at Room Temperature
作者:Jiawen Chen、Dongwei Chen、Jinqiang Kuang、Yongmin Ma
DOI:10.1021/acs.joc.1c00171
日期:2021.7.16
A transition metal-free method for de novo construction of diverse sulfonated pyrazoles from readily available sulfonyl hydrazides, 1,3-diketones, and sodiumsulfinates was established under mild conditions. Pyrazoles bearing two different sulfonyl groups were obtained in one step. The method features a diversity of substituents of the pyrazole products and a remarkably simple work-up.
aldehydes and ketones has been developed using Bu4NI (TBAI) as the catalyst. In the presence of DTBP–TBHP/p-TsOH, aldehydes undergo radical coupling with ketones to provide the desired products in moderate to high yields at 120 °C. Although various substituents on the aromatic ring of aldehydes are well tolerable under the standard reaction conditions, the protocol is limited by the scope of ketones. The method
使用Bu 4 NI(TBAI)作为催化剂,已经开发了一种从醛和酮合成1,3-二酮的有效方法。在DTBP–TBHP / p -TsOH的存在下,醛与酮进行自由基偶联,从而在120°C下以中等至高收率提供所需的产物。尽管在标准反应条件下醛的芳环上的各种取代基均具有良好的耐受性,但该方案受到酮的范围的限制。该方法在起始原料容易获得,操作简单,官能团耐受性和不存在金属催化剂方面显示出优点。