A simple and efficient method is described for a general synthesis of 4-dialkylamino-5-methoxy-1,2-benzoquinones 3 which involves, in polar solvents, a regioselective (>95%) nucleophilic monosubstitution by a wide range of secondary alliphatic amines on an easily prepared 1,2-quinone 1. Regioselectivity is not observed in the reaction of primary amines with 1, but a further reaction with an alcohol in basic medium allows valorization of the undesirable product.
本文描述了一种简便高效的方法,用于合成4-二烷基
氨基-5-甲
氧基-1,
2-苯醌3,该方法在极性溶剂中,通过广泛的
脂肪族二级胺对易于制备的1,
2-苯醌1进行区域选择性(>95%)的亲核单取代反应。一级胺与1的反应没有区域选择性,但在碱性介质中进一步与醇反应可以对不理想的产物进行利用。