2-Nitrocycloalkanones are smoothly converted into dicarboxylic acids or ketoacids, depending on whether the nitro group is secondary or tertiary, by treatment with aqueous 30% hydrogen peroxide and potassium carbonate in methyl alcohol solution for 8-10h at room temperature.
with aqueous 0.05 M NaOH, at 80 °C, in the presence of cetyltrimethylammonium chloride (CTACl) as a cationic surfactant, produces ω-nitro acids 2 in good yields. Reduction of the latter with HCOONH4/Pd-C, in methanol, at 80 °C affords ω-aminoacids 3. The synthesis of methyl 9-oxodecanoate (8) is also reported.
Herein, we report a new, efficient and sustainable syntheticprotocol for the preparation of ω-nitro esters starting from cyclic 2-nitro ketones. The method involves the use of polymer bound BEMP and provides the target compounds in excellent yields and low process mass intensity and E-factor values.
α-Nitro ketones 7:1 synthesis of conjugated nitrocyclohexenes
作者:Pimchit Dampawan、Walter W. Zajac
DOI:10.1016/s0040-4039(00)86767-2
日期:1982.1
The reduction of 2-nitrocyclohexanones to the 2-nitrocyclohexanols with sodiumborohydride followed by treatment of the β-nitroalcohols with sodium hydride and subsequent acidification of the salts leads to the regioselective synthesis of conjugatednitrocyclohexenes from cyclohexanones.