Nouvelle voie d'acces aux β-nitroenones premiere preparation de β-nitroenones acycliques
摘要:
We describe here a new and mild method of synthesis of acyclic beta-nitroenones. Nitroepoxydes IVunderbar, prepared by epoxydation of the allylic nitroolefins IIIunderbar, react with silicagel or aluminium isopropoxide according to the substrate, to give the nitroethylenic alcohols Vunderbar. Their oxydation by PCC under sonication leads to the beta-nitroenones VIunderbar.
We describe here a new and mild method of synthesis of acyclic beta-nitroenones. Nitroepoxydes IVunderbar, prepared by epoxydation of the allylic nitroolefins IIIunderbar, react with silicagel or aluminium isopropoxide according to the substrate, to give the nitroethylenic alcohols Vunderbar. Their oxydation by PCC under sonication leads to the beta-nitroenones VIunderbar.
A Convenient Two-Step Procedure for the Synthesis of DI-and Trisubstituted α-Nitroalkenes from Tertiary β-Nitro Alcohols
Abstract Treatment of tertiary β-nitro alcohols I, obtained by addition of lithium α-lithionitronates to ketones, with acetic anhydride followed by 1 equivalent of potassium methoxide or t-butoxide, according to the nature of R2, gives α-nitroalkenes III in good yields.