无溶剂条件下以N-甲基-2-吡咯烷酮硫酸氢盐为离子液体催化剂高效、环境友好一锅法合成1,5-苯二氮衍生物(英文)

A powerful and environmentally benign method has been developed for the one-pot synthesis of 4-substituted-1,5-benzodiazepines via the three-component reaction of a series of aldehydes with dimedone and o-phenylenediamine using H-NMP]HSO_4] as a Brnsted acidic ionic liquid catalyst under solvent-free conditions. The key benefits of this new method over existing techniques include high yields, the use of a green catalyst, short reaction times and facile catalyst separation.