Ionic liquid/PPh3 promoted cleavage of diphenyl disulfide and diselenide: a straight-forward metal-free one-pot route to the synthesis of unsymmetrical sulfides and selenides
作者:Subhash Banerjee、Laksmikanta Adak、Brindaban C. Ranu
DOI:10.1016/j.tetlet.2012.02.047
日期:2012.4
A metal-free cleavage of diphenyl disulfide and diphenyl diselenide has been achieved using ionic liquid/triphenyl phosphine (PPh3) and a convenient protocol for the one-pot synthesis of unsymmetrical sulfides and selenides by condensing ‘in situ’ generated thiolate or selenate anion with alkyl halides has been developed. In addition, 1,4-conjugate addition of the generated thiolate anions to activated
使用离子液体/三苯基膦(PPh 3)和便捷的方案,通过“原位”生成的硫醇盐或硒酸根离子缩合一锅合成不对称的硫化物和硒化物,已实现了对二苯基二硫化物和二苯基二硒化物的无金属裂解。已经开发出具有卤代烷的化合物。此外,还证明了将生成的硫醇盐阴离子与1,4-共轭加成到活化烯烃上。离子液体溴化1-甲基-3-戊基咪唑鎓[pmIm] Br在促进反应过程中起着至关重要的作用,并且与其他溶剂相比,具有出色的活性和选择性。[pmIm] Br已被重复使用至少五次而没有明显的活性损失。