Synthesis of 2-hydroxy-5,6-diarylnicotinonitriles and 2-chloro-5,6-diarylnicotinonitriles from β-chloroenones
摘要:
Vilsmeier-Haack reaction of beta-ketoaldehydes leads to the formation of beta-chloroenones and these chloroenones on treatment with malononitrile afford 2-hydroxy-5,6-diarylnicotinonitriles. But a one-pot reaction of beta-ketoaldehydes with Vilsmeier-Haack reagent and malononitrile or cyanoacetamide results in the formation of 2-chloro-5,6-diarylnicotinonitriles in good yields. (C) 2014 Elsevier Ltd. All rights reserved.