A variety of nucleophiles provided by activated methylenes have been added on 3-(2-nitrovinyl)-1H-indole in very good to excellent yields, under sonication and solvent-free conditions, using solid potassium carbonate or sodium acetate as a base. Direct synthesis avoiding preliminary NH protection is reported and exemplified to 15 molecules.
Reduction of aromatic and aliphatic nitro groups to anilines and amines with hypophosphites associated with Pd/C
The reduction of aromatic and aliphatic nitro groups to anilines and amines is performed with good yield and selectivity in short reaction times. A mixture of sodium hypophosphite and phosphinic acid is used in the presence of a heterogeneous catalyst 2.5 mol% of Pd/C (5%) in a biphasic water/2-MeTHF system.
Michael addition to unprotected 3-(2-nitrovinyl)indoles under the conditions of microwave synthesis
作者:Alexander V. Aksenov、Nikolai A. Aksenov、Anton A. Skomorokhov、Inna V. Aksenova、Georgii D. Gryaznov、Leonid G. Voskressensky、Michael A. Rubin
DOI:10.1007/s10593-017-1988-x
日期:2016.11
method for the synthesis of substituted indoles using conjugate addition of nucleophiles to 3-(2-nitrovinyl)indoles has been developed. The addition of nucleophiles generated in the presence of a base from CH acids was investigated. The studied reactions proceed quickly and smoothly under the conditions of microwave activation and do not require protection of the indole nitrogen atom.