A novel modification of the classical Julia-Lythgoe olefination, using sulfoxides instead of sulfones, affords, after in situ benzoylation and SmI2/HMPA or SmI2/DMPU-mediated reductive elimination, 1,2-di-, tri- and tetrasubstituted olefins in moderate to good yields and E/Z selectivity. The conditions are mild and the procedure is widely applicable. The reaction mechanism was studied and a general model, describing the reaction selectivity, is proposed.
经典的Julia-Lythgoe烯化反应的一种新型改进,使用亚砜代替砜,经过原位苯甲酰化和SmI2/HMPA或SmI2/DMPU介导的还原消除,以中等至良好的产率和E/Z选择性得到1,2-二、三和四取代烯烃。条件温和,程序广泛适用。研究了反应机理,并提出了描述反应选择性的一般模型。