Iodopentafluorosulfanylation of [1.1.1]propellane and further functionalizations

Pentafluorosulfanylated(SF_(5^(-))) aromatics have shown great potential in drugs, and the bioisosteric replacement of aromatic ring with bicyclo[1.1.1]pentane(BCP) unit has attracted considerable attention recently. Consequently, pentafluorosulfanylated bicyclo[1.1.1]pentanes(SF_(5^(-))BCPs) should have application in the realm of drug discovery. In this study, a one-pot iodopentafluorosulfanylation of [1.1.1]propellane with SF_(5)Cl and CH_(2)I_(2)for the practical synthesis of iodopentafluorosulfanylated bicyclo[1.1.1]pentane(SF_(5^(-))BCP-I) was developed. SF_(5^(-))BCP-I was the first example of SF_(5^(-))BCPs that could be transformed. The first general method to access SF_(5^(-))substituted bicyclo[1.1.1]pentane derivatives was demonstrated through photoredox-catalyzed radical addition of SF_(5^(-))BCP-I to alkenes and alkynes.

季戊四醇四硝酸酯及其五氟硫基衍生物性能的理论研究

运用密度泛函B3LYP方法,以6-31G*为基组,对季戊四醇四硝酸酯(PETN)和它的4个五氟硫基(—SF_5)取代物五氟硫基季戊三醇三硝酸酯(PPTN)、二-五氟硫基季戊二醇二硝酸酯(PDPDN)、三-五氟硫基季戊醇硝酸酯(PTPN)和四-五氟硫基季戊烷(TPNT)进行了研究,优化了它们的分子几何构型,进行了振动频率分析,计算预测了它们的密度、热力学函数、爆轰性能和可能的热分解引发键的解离能。结果表明,5种化合物中,PPTN的密度和爆轰性能更好,且PPTN的稳定性优于PETN;随着—SF_5数目的增多,化合物的密度增大;但—SF_5数目过多时,化合物的爆速和爆压反而降低。PPTN的能量和稳定性满足高能量密度化合物(HEDC)的指标要求。