Abstract A new N-bromo sulfonamide reagent, namely N,2-dibromo-6-chloro-3,4-dihydro-2H-benzo[e][1,2,4]thiadiazine-7-sulfonamide 1,1-dioxide, was synthesized and used as a new and highly efficient catalyst for the preparation of 9-aryl-1,8-dioxo-octahydroxanthene derivatives by the condensation reaction of dimedone (5,5-dimethylcyclohexane-1,3-dione) and various arylaldehydes. Mechanistically, it is
摘要 一种新的N-
溴磺酰胺试剂,即N,2-dibromo-6-chloro-3,4-dihydro-2 H-苯并[e] [1,2,4]噻二嗪-7-磺酰胺1,1-二氧化物,通过
二甲酮(5,5-二
甲基环己烷-1,3-二酮)与各种芳醛的缩合反应,合成并用作制备9-芳基-1,8-二氧代-八氢
氧杂蒽衍
生物的新型高效催化剂。从机理上讲,有趣的是,在中性介质下,该反应成功地催化了催化剂中Br +离子的原位生成。 图形概要