Rongalite® promotes cleavage of diaryl disulphides generating the corresponding thiolate species in situ which then undergo facile ring-opening of epoxides in a regioselective manner under ultrasound irradiation, affording β-hydroxy sulphides in good to excellent yields. The important features of this methodology are base-free, odourless, high yield, reasonably rapid reaction rate, simple workup, high regioselectivity, cost-effective and no requirement of transition metal catalysts. It is noteworthy that ring-opening reaction of 1,2-diphenyldiselane with 2-(phenoxymethyl)oxirane are also conducted smoothly to afford β-hydroxy selenide in excellent yield under the standard conditions.
Rongalite® 可促进二芳基二
硫化物的裂解,在原位生成相应的
硫代
硫酸盐,然后在超声波辐照下以区域选择性的方式对
环氧化物进行简便的开环反应,从而以良好到极佳的收率生成 β-羟基
硫化物。这种方法的重要特点是无碱、无味、产率高、反应速度快、操作简单、高区域选择性、成本效益高,而且不需要过渡
金属催化剂。值得注意的是,在标准条件下,1,2-二苯基二
硒烷与 2-(苯氧基甲基)
环氧乙烷的开环反应也能顺利进行,并以极好的收率得到 β-羟基
硒化物。