Intramolecular Diels−Alder Cycloaddition ofN-Allyl-N-(2-furylmethyl)amides − First Step of a New Route Towards the Synthesis of a Densely Functionalized Pyrrolizidine Ring
作者:Franco Ghelfi、Andrew F. Parsons、Daniele Tommasini、Adele Mucci
The intramolecularDiels−Alder reaction of N-allyl-N-(2-furylmethyl)amides to exo-N-acyl-3-aza-10-oxatricyclo[5.2.1.01,5]dec-8-enes is described. The cycloaddition is controlled not only by the size of the amide appendage, but also by electronegativity of the amide. An example of a newapproach towards the synthesis of a highly functionalized pyrrolizidine ring, which links this Diels−Alder cycloaddition
α-perchloroacyl chlorides, from reaction of the corresponding unfunctionalized acylhalides with chlorine, was efficiently achieved under base-catalysis, using a tetraalkylammonium chloride as catalyst. The process is solvent-free and the procedure is easy, inexpensive, and suitable for scale-up. acylchlorides - halogenation - chlorine - base catalysis - 2,2-dichloroacyl chlorides
<i>N,N</i>-(Dimethylamino)-2-pyrrolidinones from the Rearrangement of <i>N</i>-Allyl-<i>N</i>‘,<i>N</i>‘-dimethyl-2,2-dichlorohydr- azides Promoted by CuCl−<i>N</i>,<i>N</i>,<i>N</i>‘,<i>N</i>‘-Tetramethylethylendiamine
作者:Franco Ghelfi、Andrew F. Parsons
DOI:10.1021/jo0004153
日期:2000.9.1
Functional rearrangement of 3-Cl or 3,3-diCl-γ-lactams bearing a secondary 1-chloroalkyl substituent at C-4
作者:Mariella Pattarozzi、Fabrizio Roncaglia、Luca Accorsi、Andrew F. Parsons、Franco Ghelfi
DOI:10.1016/j.tet.2009.11.111
日期:2010.2
The study of the reaction with MeONa/MeOH of chlorinated gamma-lactams. prepared from the atom transfer radical cyclization of N-allyl-alpha-perchloroamides, has been extended to the case of substiates carrying an exo halogen atom on a branched carbon Only with secondary exo C-Cl groups, that are not located on a fused ring, does the functional rearrangement follow the typical transformation route, Which With trichloro-lactams can proceed further to give 4-alkylidene derivatives From a practical point of view, the outcome of the reaction with di- or trichloio N-cinnamylamides is synthetically valuable, affording the 5-methoxy-IH-pyrrol-2(5H)-one or 3-benzylidenepyrrlidine-2.5-dione. respectively. in good to excellent yield (C) 2009 Elsevier Ltd All rights reserved
Korhonen, Ilpo O. O., Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1981, vol. 35, # 3, p. 175 - 178