Selective exploitation of acetoacetate carbonyl groups using imidazolium based ionic liquids: synthesis of 3-oxo-amides and substituted benzimidazoles
作者:Ankita Chakraborty、Swapan Majumdar、Dilip K. Maiti
DOI:10.1016/j.tetlet.2016.06.048
日期:2016.7
An unprecedented Brønsted base ionic liquid tuned selective aminolysis of ester carbonyl of acetoacetates is demonstrated to achieve acetoacetamide derivatives. Other imidazolium ionic liquid performs an efficient cyclization catalysis involving acetoacetate-carbonyl groups and o-phenylenediamine at elevated temperature to produce benzimidazoles via C–C bond cleavage of intermediate 1,5-benzodiazepinones
证明了空前的Brønsted碱性离子液体对乙酰乙酸酯的羰基酯进行选择性氨解,可以实现乙酰乙酰胺衍生物。其他咪唑鎓离子液体可在高温下通过乙酰乙酸酯羰基和邻苯二胺进行高效环化催化,以在无溶剂条件下通过中间体1,5-苯并二氮杂酮的C-C键裂解生成苯并咪唑。