- Practical and User-Friendly Procedure for Michael Reactions of α-Nitroketones in Water
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A variety of α,β-unsaturated carbonyl derivatives gave selective Michael additions with several α-nitrocycloalkanones in water, at room temperature without any added catalyst, or in very dilute, aqueous solutions of potassium carbonate. Both preparative methods constitute new, environmentally benign and more efficient alternatives to previous procedures.
- Miranda, Sonia,López-Alvarado, Pilar,Giorgi, Giorgio,Rodriguez, Jean,Avenda?o, Carmen,Menéndez, J. Carlos
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- Unique michael addition-initiated domino reaction for the stereoselective synthesis of functionalized macrolactones from α-nitroketones in water
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(Chemical Equation Presented) A unique domino reaction of α-nitrocycloalkanones with α-alkyl α,β-unsaturated aldehydes in aqueous base was discovered, leading to the one-pot synthesis of hitherto unknown functionalized, bridged, bicyclic lactones containing 10-, 11-, 13-, and 15-membered rings. The structures of these heterocyclic compounds, containing also an unusual 6-hydroxy-1,2-oxazine ring, were determined by spectral and single-crystal X-ray diffraction studies.
- Giorgi, Giorgio,Miranda, Sonia,Lopez-Alvarado, Pilar,Avendano, Carmen,Rodriguez, Jean,Menendez, J. Carlos
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- A novel one pot synthesis of α-nitroketones from olefins using trimethylsilylnitrate-chromium trioxide reagent system
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A variety of α-nitroketones have been obtained from the corresponding olefins in good yields upon reaction with trimethylsilylnitrate-chromium trioxide reagent system.
- Reddy, M. Venkat Ram,Kumareswaran,Vankar, Yashwant D.
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p. 7149 - 7152
(2007/10/02)
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- Synthese von N-(4-Aminobutyl)-16-aza-19-nonadecanlactam und N-(4-Aminobutyl)-17-aza-20-icosanlactam (Desoxoinandenin)
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According to Scheme 1, the two homologous macrocyclic spermidine derivatives 12 ad 23 were synthesized.Key steps in both cases were two different types of ring-enlargement reactions.Compound 12 was identical with a degradation product of the naturally occurring spermidine akaloids of inandine-type.
- Waelchli, Rudolf,Guggisberg, Armin,Hesse, Manfred
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p. 2178 - 2185
(2007/10/02)
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