β-Nitroacrylates as key building blocks for the synthesis of alkyl 3-substituted 5-oxopiperazine-2-carboxylates under fully heterogeneous conditions
摘要:
Substituted piperazines are important heterocycles possessing wide and important biological activities. Herein we report a new easy synthetic approach for preparation of alkyl 3-substituted 5-oxopiperazine-2-carboxylates using beta-nitroacrylates as key starting materials.
The reaction of β-nitroacrylates with β-enaminones, at room temperature and under solvent- and promoter-free conditions, affords the one-potsynthesis of polyfunctionalized pyrroles in high yields.