Thionation of β-lactams to β-thiolactams by silica-supported P2S5
摘要:
In this paper, an improved method for the thionation of -lactams is described. Using a solid-supported P2S5 reagent and heating under reflux conditions, -thiolactams were obtained in good to excellent yields. Also the reaction time reduced significantly compared with that achieved under the more conventional method using P2S5 alone. Furthermore, inexpensive and easily available starting materials simple reaction conditions and a simple purification process are some other advantages of this method.[GRAPHICS].
β-Lactam Preparation via Staudinger Reaction with Activated Dimethylsulfoxide
作者:Maaroof Zarei
DOI:10.1002/jhet.2685
日期:2017.3
efficient synthesis of β‐lactams has been expediently accomplished. These β‐lactams were synthesized by the Staudinger reaction of several substituted imines with various carboxylic acids using activated DMSO at ambient temperature. The imines and substituted acetic acids contain alkyl, aryl, hetero aryl, polycyclic, and 3‐electron‐withdrawing group underwent [2 + 2] ketene‐imine cycloaddition reaction
The Vilsmeier reagent: a useful and versatile reagent for the synthesis of 2-azetidinones
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1016/j.tet.2009.02.005
日期:2009.4
and oxalyl chloride or thionyl chloride, works as a versatile acid activator reagent for the direct [2+2] ketene–imine cycloaddition of substituted acetic acid and imines in one-pot synthesis under mild conditions. Monocyclic, spirocyclic and 3-electron-withdrawing group β-lactams were synthesized by this method and optimization of conditions were performed.
Utilization of DMF–PhCOCl Adduct as an Acid Activator in a New and Convenient Method for Preparation of β-Lactams
作者:Maaroof Zarei
DOI:10.1246/bcsj.20110323
日期:2012.3.15
An efficient one-potsynthesis of β-lactams by the reaction of imines with acetic acid derivatives in the presence of DMF and benzoyl chloride adduct, a cheap reagent, has been described. Optimizat...
Cerium(IV) Tetrabutylammonium Nitrate (CTAN): A Mild and Efficient N-dearylation Agent for Synthesis of N-unsubstituted 2-azetidinones
作者:Maaroof Zarei
DOI:10.3184/174751917x14902201357392
日期:2017.4
A simple and efficient protocol for the conversion of N-p-methoxyphenyl, N-p-ethoxyphenyl, N-p-methoxynaphthyl, N-3,4-dimethoxybenzyl and N-p-methoxybenzyl-2-azetidinones to N-unsubstituted 2-azetidinones using cerium(IV) tetrabutylammonium nitrate (CTAN) in dichloromethane is described. The method is compatible with a number of functional groups, and N-unsubstituted 2-azetidinones can be prepared
Copper-catalyzed thioarylation or thioalkylation of halogenated 2-azetidinones using a thiol precursor
作者:Maryam Ravandeh Ghotbabadi、Maaroof Zarei
DOI:10.1007/s00706-018-2177-z
日期:2018.8
AbstractThe paper describes the synthesis and characterization data of new 2-azetidinones containing sulfide groups. Halogenated 2-azetidinones were synthesized by the reaction of ketenes, generated in situ from various carboxylic acid in the presence of Vilsmeier reagent, with different Schiff bases. These compounds on further reaction with several aryl or alkyl halide using copper(I) iodide and sodium
摘要本文描述了含有硫化物基团的新型2-氮杂环丁酮的合成和表征数据。卤代2-氮杂环丁烷酮是通过在不同的席夫碱存在下,在Vilsmeier试剂存在下由各种羧酸原位生成的烯酮反应合成的。这些化合物在使用碘化铜(I)和硫代硫酸钠与数个芳基或烷基卤化物进一步反应后,产生了新颖的2-氮杂环丁酮,其在N-1或C-3或C-4位具有硫化物取代基。通过元素分析和光谱(IR,1 H和13 C NMR)数据对化合物进行了表征。 图形概要