Zhai Xiaofang, Pang Maofu, Feng Lei, Jia Jiong, Tung Chen-Ho, Wang Wenguang
School of Chemistry and Chemical Engineering, Shandong University No. 27 South Shanda Road Jinan 250100 China
College of Chemistry, Beijing Normal University No. 19 Xinjiekouwai St Beijing 100875 China.
Chem Sci. 2021 Jan 2;12(8):2885-2889. doi: 10.1039/d0sc06787c.
We report on the first isolation and structural characterization of an iron phosphinoimino-borane complex CpFe(η-HB[double bond, length as m-dash]NCHPPh) by dehydrogenation of iron amido-borane precursor CpFe(η-HB-NHCHPPh). Significantly, regeneration of the amido-borane complex has been realized by protonation of the iron(ii) imino-borane to the amino-borane intermediate [Cp*Fe(η-HB-NHCHPPh)] followed by hydride transfer. These new iron species are efficient catalysts for 1,2-selective transfer hydrogenation of quinolines with ammonia borane.
我们报道了通过铁氨基硼烷前体CpFe(η-HB-NHCHPPh)脱氢首次分离并对铁膦基亚氨基硼烷配合物CpFe(η-HB[双键，长度如m破折号]NCHPPh)进行结构表征。值得注意的是，通过将铁(ii)亚氨基硼烷质子化为氨基硼烷中间体[Cp*Fe(η-HB-NHCHPPh)]，然后进行氢化物转移，实现了氨基硼烷配合物的再生。这些新型铁物种是用氨硼烷对喹啉进行1,2-选择性转移氢化的高效催化剂。
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