- A practical variant of the Claisen-Eschenmoser rearrangement: Synthesis of unsaturated morpholine amides
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A Claisen-Eschenmoser type rearrangement giving rise to unsaturated morpholine-, piperidine- and pyrrolidine amides is described.
- Gradl, Stefan N.,Kennedy-Smith, Joshua J.,Kim, James,Trauner, Dirk
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- Catalyst compositions for trimerizing organic isocyanates
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Disclosed are novel compositions capable of catalytically trimerizing organic isocyanates said compositions comprising solutions of the reaction products obtained by reacting in an inert solvent in substantially equimolar proportions electron-rich ketene-aminals with electron-poor olefins having the respective formulae (I) and (II) STR1 The variously substituted electron-rich ketene-aminals (I), as the name implies, have high electron density associated with the double bond because of the two tertiary amine groups while the electron-poor olefins (II) have the opposite situation due to the presence of electron withdrawing substituents R9 and R10. Also disclosed is an improved process for trimerizing organic isocyanates using the above catalyst compositions including the preparation of polyisocyanurate polymers and isocyanurate-modified polyisocyanates.
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- Seven-Membered Rings by 1,5-Cycloadditions, VI. - 7-Aminoperhydro-1,4-oxazepines and -diazepines
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3-Alkyl-1,3-oxazolidines 2 react with enamines 1 in the presence of trifluoroacetic acid to give 7-dialkylaminoperhydro-1,4-oxazepines 3. 1,3-Dimethyl-1,3-imidazolidine (2d) reacts with 4-(2-methyl-1-propenyl)morpholine (1a) to give 1,4,6,6-tetramethyl-7-morpholino-2,3,4,5,6,7-hexahydro-1H-1,4-diazepine (3m).
- Griengl, Herfried,Prischl, Gerhard,Bleikolm, Anton
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p. 1573 - 1582
(2007/10/02)
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