An Easy and Convenient Synthesis of β-Lactams via a One-Pot Staudinger Reaction with 4-(4,6-Dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium Chloride Starting from Substituted Carboxylic Acids
作者:Maaroof Zarei
DOI:10.2174/1570178611666141201224959
日期:2015.1.1
An easy and convenient direct synthesis of 2-azetidinones is described. The [2+2] cycloaddition reaction of
imines and carboxylic acids using 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM) has
been employed to synthesize a variety of 2-azetidinones in high yields. The products were easily isolated because the byproducts
are highly soluble in water.
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.
From Solution-Phase to ‘On-Column’ N-Dearylation of β-Lactams by Silica-Supported Ceric Ammonium Nitrate (CAN-SiO<sub>2</sub>)
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1055/s-2008-1032051
日期:2008.2
It has been shown that N-(4-methoxy or 4-ethoxyphenyl) groups can be oxidatively removed by silica gel supported ceric ammonium nitrate (CAN-SiO2) under mild conditions in solution and on column. The yields in these two methods were good to excellent and purification of products is simpler than the general method by CAN. Especially the ‘on-column’ reaction is mild, easy, efficient, and cheap. The lower mobility of CAN-SiO2 makes it safer to handle.
The Vilsmeier reagent as an efficient acid activator for the synthesis of β-lactams
作者:Aliasghar Jarrahpour、Maaroof Zarei
DOI:10.1016/j.tetlet.2007.10.012
日期:2007.12
The Vilsmeier reagent (chloromethylenedimethylammonium chloride) has been used as an efficient and cheap acid activator for the one-step Staudinger reaction of substituted acetic acids and imines under mild conditions. This reaction is clean and the by-products are DMF and triethylamine hydrochloride which were removed by simple aqueous work-up. (c) 2007 Published by Elsevier Ltd.
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.