- New synthesis of 2-methyleneaziridines and 2-methyleneazetidines by dimethyl titanocene mediated methylenation of α- and β-lactams
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2-Methyleneaziridines and 2-methyleneazetidines were synthesized via a titanium mediated olefination procedure starting from the corresponding α- lactams and β-lactams. (C) 2000 Elsevier Science Ltd.
- Abbaspour Tehrani, Kourosch,De Kimpe, Norbert
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p. 1975 - 1978
(2007/10/03)
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- Reduction of β-Lactams, II. Reaction of 3,3-Dimethyl-1-phenyl-2-azetidinone and 3,3,3',3'-Tetramethyl-2,2'-dione with Phosphorous Oxychloride and 1,2-Phenylenedioxytrichlorophosphorane
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3,3,3',3'-Tetramethyl-2,2'-dione (7) rearranges upon treatment with POCl3 to give the bicyclic hydrazide 8 which is then transformed into the monocyclic iminium salt 9.The azine 16, which is formed from 7 with 1,2-phenylenedioxytrichloro
- Verkoyen, Carl,Rademacher, Paul
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p. 3048 - 3055
(2007/10/02)
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- Convenient Syntheses of Cyclic Carboxamides from α,β,γ,δ and ε-halocarboxamides under Phase Transfer Conditions
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Piperazine-2,5-diones (2) were prepared by N-alkylation between two molecules of α-halocarboxamides (1) in the presence of a phase transfer catalyst in yields of 64-88percent. β,γ,δ and ε-Lactams (6,9 and 13) were similarly synthesized by intramolecular N-alkylation of the corresponding halocarboxamides (5, 8 and 12) under phase transfer conditions in 53-99percent yields.Keywords--piperazine-2,5-dione; β-lactam; γ, δ, and ε lactams; bis-β-lactam; phase transfer catalyst; intramolecular N-alkylation
- Okawara, Tadashi,Matsuda, Takashi,Furukawa, Mitsuru
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p. 1225 - 1233
(2007/10/02)
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