通过用二硒化物通过电氧化促进炔烃的分子内环化,开发了一种温和、实用、无金属和无氧化剂的方法,用于合成各种 C-3 硒化苯并[ b ]呋喃衍生物。在分别配备碳和铂板作为阳极和阴极的未分隔电池中,在恒定电流下以良好至优异的产率获得了范围广泛的硒取代的苯并[ b ]呋喃衍生物,具有高区域选择性。此外,收敛方法表现出良好的官能团耐受性,并且可以很容易地以良好的效率进行放大,从而从简单、容易获得的起始材料中快速获得各种硒化苯并[ b ]呋喃衍生物。
copper-catalyzed C–S or C–Se bond formation between aryl iodides and easily available chalcogen sources leading to diaryl chalcogenides is reported. A variety of symmetrical diaryl sulfides and diaryl selenides were synthesized in good to excellent yields. Unsymmetrical diaryl sulfides were also obtained in moderate yields from two different aryl iodides by a one-pot tandem process. This strategy was
作者:He M. Lin、Yu Tang、Zhi H. Li、Kun D. Liu、Jun Yang、Yuan M. Zhang
DOI:10.3998/ark.5550190.0013.814
日期:——
atmosphere, a simple and efficient procedure for the synthesis of symmetrical selenides has been developed by the reaction of aryl or alkyl halides with magnesium (1.5 equiv) and elemental selenium (1.0 equiv) in the absence of catalyst and ligand in THF and toluene under reflux at 86°C. This protocol has been utilized for the synthesis of a variety of symmetrical selenides in good to excellent yields
An unprecedented transfer of selenium ion from potassium selenocyanate was observed in C-Se cross-coupling reaction catalyzed by copper oxide nanoparticles under ligand-free conditions. Utilizing this protocol wide range of symmetrical diaryl selenides were obtained in excellent yields. Nano-CuO is recyclable up to four cycles without loss of catalytic activity.
An efficient and conceptually new protocol for C–Secrosscoupling of potassium selenocyanate with arylhalides via copper-catalyzed cascade reaction has been developed in water. Utilizing this protocol, a variety of aryl and heteroaryl halides were reacted with potassium selenocyanate to afford the corresponding diaryl selenides in moderate to good yields.
efficient, and eco-friendly synthetic protocol has been developed for the preparation of diaryl seleniumcompounds. To the best of our knowledge, this is the first Letter on the use of selenium dioxide as selenium source for the synthesis of diaryl selenides. Compared with other selenium sources the new source SeO2 gives an environment-friendly and low-cost synthetic route, which may be useful for