1,3-Diphenylthiazolo[3,4-a]benzimidazole, a new 10π-electron heterocycle containing tetravalent sulfur, was prepared by the reaction of 1,2-dibenzoylbenzimidazole with phosphorus pentasulfide in refluxing toluene. Its cycloadditions with alkenes and alkynes occurred across the thiocarbonyl ylide dipole in highly stereoselective and/or regiospecific fashions.
1,2-二苯甲酰基
苯并咪唑与五
硫化二
磷在
甲苯中回流反应,制备了1,3-二苯基
噻唑并[3,4-a]
苯并咪唑,一种新的含四价
硫的10π-电子杂环。它与烯烃和
炔烃的环加成以高度立体选择性和/或区域特异性的方式发生在
硫代羰基叶立德偶极子上。