A Cationic NCN Pincer Platinum(II) Aquo Complex with a Bis(imidazolinyl)phenyl Ligand: Studies toward its Synthesis and Asymmetric Friedel–Crafts Alkylation of Indoles with Nitroalkenes
作者:Xin-Qi Hao、Yan-Xiao Xu、Ming-Jun Yang、Li Wang、Jun-Long Niu、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/om200714z
日期:2012.2.13
structures of the neutral symmetrical Pt(II) complexes 2c,d and 3c,d and the unsymmetrical Pt(II) complex 7b as well as the cationic Pt(II) aquo complex 4 have been determined by X-ray single-crystal analysis. The cationic complexes 4 and 5a,c have been applied to the asymmetric Friedel–Crafts alkylation of indoles with nitroalkenes. Among them, the aquo complex 4 was found to be effective under the given
报道了对具有手性双(咪唑啉基)苯基(Phebim)配体的阳离子NCN钳式铂(II)水络合物的合成和表征的研究。在这些研究中,新的对称Phebim-H配体1c,d和不对称杂唑啉-咪唑啉杂配体6a – c以及相关的中性对称NCN钳形Pt(II)配合物2b – d和3a – d以及不对称NCN'钳子7a,b和8c已经被隔离和表征。尽管进行了大量尝试,但只有一种预期的阳离子手性NCN钳形Pt(II)配合物(4)含有水作为Pt(II)中心的可交换中性配体,是从中性Pt–I配合物3a与AgOTf在室温下于湿CH 2 Cl 2中的反应以纯净形式获得的。相反,在室温下在CH 2 Cl 2中吡啶存在下,中性Pt-Cl络合物2a,c与AgOTf的反应可以容易地高收率地制备阳离子Pt(II)吡啶络合物5a,c。中性对称的Pt(II)配合物2c,d和3c,d的分子结构并通过X射线单晶分析确定了不对称的Pt(II)