A Copper- and Amine-Free Sonogashira Reaction of Aryl Halides Catalyzed by 1,3,5-Triaza-7-phosphaadamantane Palladium Systems
摘要:
The monomeric complex [Pd(dmba) Cl(PTA)] [dmba = N,C-chelating 2-(dimethylaminomethyl) phenyl; PTA = 1,3,5-triaza-7-phosphaadamantane] has been obtained and its crystal structure has been established by X-ray diffraction. Conditions for an efficient copper-and amine-free catalyzed Sonogashira reaction of aryl bromides and chlorides with terminal alkynes by [Pd(dmba)Cl(PTA)] and Pd(OAc)(2)/PTA have been developed. It is worthwhile noting that a relatively low palladium catalyst loading has been employed.