Argentic oxide mediated N-dearylation of β-lactams
摘要:
A method is described for the N-dearylation of N-(4-methoxy- or 4-ethoxyphenyl)-2-azetidinones with argentic oxide. The yields are good-to-excellent and the reaction is simple, efficient, and fast. (C) 2011 Elsevier Ltd. All rights reserved.
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.
Ceric Ammonium Nitrate on Silica Gel for Solid–Solid Phase<i>N</i>-Dearylation of β -Lactams
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1080/10426500802336630
日期:2009.7.13
Silica gel-supported ceric ammonium nitrate (CAN-SiO(2)) has been found to be an effective reagent for the solid-solid phase and solvent-free N-dearylation of beta-lactams. The results have been compared with CAN alone in solution and solid-solid phase.
Argentic oxide mediated N-dearylation of β-lactams
作者:Maaroof Zarei、Aliasghar Jarrahpour
DOI:10.1016/j.tetlet.2011.01.022
日期:2011.3
A method is described for the N-dearylation of N-(4-methoxy- or 4-ethoxyphenyl)-2-azetidinones with argentic oxide. The yields are good-to-excellent and the reaction is simple, efficient, and fast. (C) 2011 Elsevier Ltd. All rights reserved.
Efficient one-pot synthesis of 2-azetidinones from acetic acid derivatives and imines using methoxymethylene-N,N-dimethyliminium salt
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1016/j.tet.2010.05.009
日期:2010.7
A cheap, versatile and convenient method for synthesis of beta-lactams using methoxymethylene-N,N-dimethyliminium salt as an acid activator in Staudinger reaction is reported. This method is used for the preparation of monocyclic, spirocyclic, N-alkyl and three-electron-withdrawing group beta-lactams. The products are obtained in good to excellent yields. (C) 2010 Elsevier Ltd. All rights reserved.