Aroylimidazo[1,2-a][1,3,5]triazines are rapidly synthesized via a facile and mild reaction of 2-amino-triazines and 1,3-dicarbonyl compounds using NBS. The reaction occurred with good yields and excellent regioselectivity, and β-keto esters, β-keto amides, and 1,3-diones were tolerated under the optimized procedure. In addition, the successful application of this methodology for a gram-scale reaction
使用NBS通过2-氨基三嗪和1,3-二羰基化合物的轻度和温和反应可以快速合成Aroylimidazo [1,2- a ] [1,3,5]三嗪。该反应以良好的收率和优异的区域选择性进行,并且在优化的程序下耐受β-酮酯,β-酮酰胺和1,3-二酮。此外,这种方法在克级反应中的成功应用表明其具有大量合成的潜力。
Lewis Acid Regulated Divergent Catalytic Reaction between Quinone Imine Ketals (QIKs) and 1,3‐Dicarbonyl Compounds: Switchable Access to Multiple Products Including 2‐Aryl‐1,3‐Dicarbonyl Compounds, Indoles, and Benzofurans
A catalytic Lewis acid regulated reaction between quinone imine ketals (QIKs) and 1,3-dicarbonyl compounds provides a divergent and tunable approach to a variety of skeletons, including a series of 2-aryl-1,3-dicarbonyl compounds, indoles, and benzofurans. The use of lithium chloride and ferrous bromide gives C3- or C2-alkylation products of the QIKs. The combination of ferrous bromide and trifluoromethanesulfonic
Copper/Iodine‐Cocatalyzed C‐C Cleavage of 1,3‐Dicarbonyl Compounds Toward 1,2‐Dicarbonyl Compounds
作者:Li‐Sha Chen、Lu‐Bing Zhang、Yue Tian、Jin‐Heng Li、Yong‐Quan Liu
DOI:10.1002/ejoc.202000795
日期:2020.9.14
DMSO multi‐tasking enabled a copper/I2‐cocatalyzed transformations of 1,3‐dicarbonyl compounds to 1,2‐dicarbonyl compound is depicted. This method is achieved through a sequence of C–C oxidative cleavage and CO release using DMSO as oxidant, oxygen source and solvent, which is general to a wide range of 1,3‐dicarbonyl compounds, including 1,3‐diketones, 1,3‐keto esters and 1,3‐keto amides, with excellent
DMSO多任务处理实现了铜/ I 2催化的1,3-二羰基化合物向1,2-二羰基化合物的转化。该方法是通过使用DMSO作为氧化剂,氧气源和溶剂的一系列C–C氧化裂解和CO释放来实现的,该过程通常适用于各种1,3-二羰基化合物,包括1,3-二酮,1, 3-酮酸酯和1,3-酮酸酯,具有出色的选择性和广泛的官能团耐受性。
One-pot synthesis of 5-(substituted-amino)pyrazoles
作者:Dharmpal S Dodd、Rogelio L Martinez
DOI:10.1016/j.tetlet.2004.04.017
日期:2004.5
An efficient and mild one-potsynthesis of substituted 5-alkylamino and/or 5-(arylamino)pyrazoles is described. A suitably decorated β-ketoamide, an aryl or alkyl hydrazine and Lawesson's reagent are suspended in THF/Py and gently heated to yield the requisite 5-aminopyrazoles.
Selective α-amination and α-acylation of esters and amides via dual reactivity of O-acylhydroxylamines toward zinc enolates
作者:Stacey L. McDonald、Qiu Wang
DOI:10.1039/c3cc49296f
日期:——
Selective alpha-amination and alpha-acylation of esters and amides have been developed, employing O-acylhydroxylamines as a dually reactive aminating and acylating reagent. Treatment of zinc enolates with O-acylhydroxylamines provides solely 1,3-dicarbonyl compounds under mild conditions. Introduction of a copper catalyst into the system shifts the reactivity entirely, yielding alpha-amination products