A DBU-mediated synthesis of 1,3,5-trisubstituted benzenes was developed via the [2 + 4] annulation of in situ activated α,β-unsaturated carboxylic acids and α-cyano-β-methylenones. The dual role of DBU as Brønsted base and nucleophilic Lewis base is the key for the success of the reaction.
通过原位活化的α,β-不饱和
羧酸和α-
氰基-β-甲基烯酮的[2 + 4]环空反应,开发了
DBU介导的1,3,5-三取代苯的合成方法。
DBU作为Brønsted碱和亲核Lewis碱的双重作用是反应成功的关键。