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.
DMF-dimethyl sulfate as a new reagent for the synthesis of β-lactams
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1016/j.tetlet.2009.01.092
日期:2009.4
alkoxymethylene-N,N-dimethyliminium salts, the adduct formed from DMF and O-alkylating agents. The advantages of this new method are mild reaction conditions, low cost, avoiding the use of chlorinating agents and easy purification of the products. The best results were obtained when DMF and dimethyl sulfate were used at room temperature.
Silphos as an efficient heterogeneous reagent for the synthesis of 2-azetidinones
作者:Maaroof Zarei、Aliasghar Jarrahpour
DOI:10.1515/hc-2014-0177
日期:2014.12.1
Abstract
This report provides a description of an efficient and simple procedure for the synthesis of 2-azetidinones via a one-pot reaction of imines and carboxylic acids in the presence of silicaphosphine at room temperature. The reagent is cheap and stable. The yields are good to excellent, and the reaction conditions are mild.
One Pot, Simple, and Efficient Synthesis of 2-Azetidinones Mediated by 3-(Diethoxyphosphoryloxy)-1,2,3-benzotriazin-4-(3H)-one
作者:Mahnaz Saraei、Maaroof Zarei、Saleheh Zavar
DOI:10.2174/1570180814666170612120845
日期:2017.8.22
(diethoxyphosphoryloxy)-1,2,3-benzotriazin-4-(3H)-one (DEPBT) for the synthesis of 2-azetidinones under mild reaction conditions at room temperature. Methods: The present methodology deals with one pot [2+2] ketene-imine cycloaddition reaction of imine and substituted ketene to synthesis of 2-azetidinones in mild condition at room temperature. In addition, detailed experimental procedures are provided. Results:
Synthesis of Novel N-(4-Ethoxyphenyl) Azetidin-2-ones and Their Oxidative N-Deprotection by Ceric Ammonium Nitrate
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.3390/12102364
日期:——
It is shown that the N-(p-ethoxyphenyl) group on beta-lactams can be oxidatively removed by ceric ammonium nitrate in good yield. Fourteen newN-(p-ethoxyphenyl)-2-azetidinones 8a-n were synthesized through standard [2+2] ketene-imine cycloadditions (Staudinger reaction). Treatment of these compounds with ceric ammonium nitrate yielded the N-dearylated 2-azetidinones 9a-n in good to excellent yields