Michael addition to 3-(2-nitrovinyl)indoles – route toward aliphatic nitro compounds with heterocyclic substituents
作者:Nicolai A. Aksenov、Anton A. Skomorokhov、Alexander V. Aksenov、Leonid G. Voskressensky、Michael A. Rubin
DOI:10.1007/s10593-019-02493-7
日期:2019.6
Synthetic approach toward indole derivatives bearing 2-nitroethyl group and polar azole moiety has been developed. This method involves conjugate addition of 1,3-dicarbonyl compounds to 3-(2-nitrovinyl)-1H-indoles followed by cyclocondensation with hydrazine or hydroxylamine to furnish pyrazole or isoxazole ring. Application of microwave activation allows to obtain the target indole derivatives in