Sequential Addition of Phosphine to Alkynes for the Selective Synthesis of 1,2-Diphosphinoethanes under Catalysis. Well-Defined NHC-Copper Phosphides vs in Situ CuCl<sub>2</sub>/NHC Catalyst
作者:Jia Yuan、Lizhao Zhu、Jianying Zhang、Jianfeng Li、Chunming Cui
DOI:10.1021/acs.organomet.6b00854
日期:2017.1.23
The well-defined NHC-copper phosphides [(NHC)CuPPh2](3) (1, NHC = 1,3-diisopropy1-4,5-dimethyli- midazol-2-ylidene (I'Pr); 2, NHC = N,N-di-tert-butylimidazol-2-ylidene ((IBu)-Bu-t)) have been prepared by the reaction of simple copper halides with HPPh2 in the presence of N-heterocyclic carbenes (NHCs). Complexes 1 and 2 enabled catalytic double hydrophosphination of alkyl and aryl terminal alkynes to yield 1,2-diphosphinoethanes selectively in good yields. On the basis of these results, the most efficient and pratical in situ CuCl2/NHC catalyst has been developed. It catalyzes the selective double hydrophosphination of the alkynes with high efficiency and a wide substrate scope and exhibits even better performance than the well-defined NHC-Cu phosphides. The mechanistic studies disclosed that the formation of a copper acetylide in the catalytic cycle played an important role in the acceleration of the catalytic process.