32418-04-5Relevant articles and documents
Tri- and tetrasubstituted N-phthalimidoaziridines in 1,3-dipolar cycloaddition reactions
Ushkov, Alexander V.,Kuznetsov, Mikhail A.,Linden, Anthony,Heimgartner, Heinz
experimental part, p. 847 - 862 (2010/08/06)
The thermal reactions of the 2,2,3-trisubstituted N-phthalimidoaziridine 1a with dimethyl acetylenedicarboxylate (DMAD), thioketones 4a - 4d, and dimethyl azodicarboxylate (5) proceed even at room temperature leading to the five-membered cycloadducts 2a, 6 - 8, and 12, respectively, with retention of the spatial arrangement of the aziridine substituents, in contrast to the expectation based on the conservation of orbital symmetry in concerted reactions. The analogous reactions of the tetrasubstituted phthalimidoaziridine 1b with thioketones at 40° lead to the 1,3-thiazolidine derivatives 10 and 11 as mixtures of diastereoisomers. These unexpected results may be explained by either the isomerization of the intermediate azomethine ylides or a non-concerted stepwise cycloaddition reaction of these ylides with the dipolarophiles. The structures of some adducts have been determined by X-ray crystallography.
Cycloadditions of Isocyanides to Azomethine Ylides. Synthesis and Properties of 1-Phthalimidoazetidines
Charrier, Josiane,Foucaud, Andre',Person, Herve',Loukakou, Emile
, p. 481 - 486 (2007/10/02)
Reactions of isocyanides with 1-phthalimidoaziridines 1,5, and 11 gave 1-phthalimidoazetidines by cycloaddition to the azomethine ylides that are in equilibrium with the aziridines. (tert-Butylimino)azetidines and (tert-octylimino)azetidines rearranged into open-chain azadienes.Reactions of hydrazine hydrate with 1-phthalimidoazetidines did not give the corresponding N-aminoazetidines, but rather their decomposition products, nitrogen and enamino esters.
