Chiral Recognition and Dynamic Thermodynamic Resolution of Sulfoxides by Chiral Iridium(III) Complexes
作者:Su-Yang Yao、Xing-Yang Chen、Yan-Ling Ou、Bao-Hui Ye
DOI:10.1021/acs.inorgchem.6b02494
日期:2017.1.17
sulfoxides 2-(alkylsulfinyl)phenol (HLO-R, R = Me, Et, iPr, and Bn) rather than (S)-configuration sulfoxides under thermodynamic equilibrium due to the hydrogen-bonding interaction and the differences in the steric interference, and thus act as a highly efficient enantioreceptor for resolution of sulfoxide enatiomers. Treatment of Λ-[Ir(ppy)2(MeCN)2](PF6) with 2 equiv of rac-HLO-R offered (S)-HLO-R in yields
首先证明具有手性金属的旋光性Ir(III)配合物Λ-[Ir(ppy)2(MeCN)2 ](PF 6)(ppy为2-苯基吡啶)优先与(R)-反应。由于氢键相互作用和空间干扰的差异,在热力学平衡下,构型亚砜2-(烷基亚磺酰基)苯酚(HLO-R,R = Me,Et,i Pr和Bn),而不是构型亚砜(S) ,因此可作为拆分亚砜对映体的高效对映体。用2当量rac -HLO-R提供的对Λ-[Ir(ppy)2(MeCN )2(MeCN)2 ](PF 6)的处理(S)-HLO-R的产率为46-47%,对映体过量(ee)值为97-99%,而Λ-[Ir(ppy)2 (S -LO-R}]复合物的产率为89-93 %,其中非对映异构体过量98%(de)。(R)-HLO-R手性亚砜是通过在配位溶剂MeCN存在下将Λ-[Ir(ppy)2 (S)-LO-R}]配合物与三氟乙酸(TFA)一起酸解而获得的45-47%的