A new route to 2-oxazolines, bis-oxazolines, and 2-imidazoline-5-ones from imidates using solvent-free cycloadditions: Synthesis, chemical properties, and PM3 MO calculations
作者:Jean Michel Lerestif、Loïc Toupet、Sourisak Sinbandhit、François Tonnard、Jean Pierre Bazureau、Jack Hamelin
DOI:10.1016/s0040-4020(97)00295-0
日期:1997.5
The 1,3-dipolar cycloadditions between imidate 1, derived from dimethylaminomalonate and aldehydes 2(a-f), phthalaldehyde 2g, isophthalaldehyde 2h. 4-chlorophenylisocyanate 9a, ethoxycarbonylisothiocyanate 9d as dipolarophiles proceeds regioselectively in good yield using solvent-free conditions. Synthesis of ortho- and meta-bis-(2′-oxazoline-5′-yl)benzenes 6g, 6h are also reported. The regiochemistry
Lewis Acid Catalyzed Dipolar Cycloadditions of an Activated Imidate
作者:Roy K. Bowman、Jeffrey S. Johnson
DOI:10.1021/jo0485536
日期:2004.11.1
simple Lewisacids revealed that N-malonylimidates undergo catalyzed [3+2] cycloadditionreactions with aldehydes, imines, and activated olefins to form oxazolines, imidazolines, and pyrrolines, respectively. Reactions proceed optimally at ambient temperature with the addition of 5 mol % of MgCl2 in CH3CN. Experiments aimed at elucidation of the reactive intermediate undergoing cycloaddition suggest