β-Nitroacrylates as Useful Building Blocks for the Synthesis of Alkyl Indole-2-Carboxylates
摘要:
Polyfunctionalized alkyl indole 2-carboxylates can be easily synthesized starting form -nitroacrylates and o-bromoanilines through an addition-elimination process followed by an intramolecular palladium-catalyzed Heck reaction.
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.