Iron‐Catalyzed Highly Enantioselective
<i>cis</i>
‐Dihydroxylation of Trisubstituted Alkenes with Aqueous H
<sub>2</sub>
O
<sub>2</sub>
作者:Jinhu Wei、Liangliang Wu、Hai‐Xu Wang、Xiting Zhang、Chun‐Wai Tse、Cong‐Ying Zhou、Jie‐Sheng Huang、Chi‐Ming Che
DOI:10.1002/anie.202002866
日期:2020.9.14
cis‐dihydroxylation of trisubstituted alkenes are scarce. The iron(II) complex cis‐α‐[FeII(2‐Me2‐BQPN)(OTf)2], which bears a tetradentate N4 ligand (Me2‐BQPN=(R,R)‐N,N′‐dimethyl‐N,N′‐bis(2‐methylquinolin‐8‐yl)‐1,2‐diphenylethane‐1,2‐diamine), was prepared and characterized. With this complex as the catalyst, a broad range of trisubstituted electron‐deficient alkenes were efficiently oxidized to chiral
缺乏可靠的三取代烯烃对映选择性顺式-二羟基化方法。具有二齿N 4配体(Me 2 -BQPN =(R,R)-N,N'的铁(II)顺式-α-[Fe II(2-Me 2 -BQPN)(OTf)2 ]制备并表征了N-二甲基N,N'-双(2-甲基喹啉-8-基)-1,2-二苯乙烷-1,2-二胺。使用这种络合物作为催化剂,可将多种三取代的缺电子烯烃有效地氧化为手性顺式当在温和条件下使用过氧化氢(H 2 O 2)作为氧化剂时,二醇的收率可达98%,ee高达99.9%。进行了实验研究(包括18 O-标记,ESI-MS,NMR,EPR和UV / Vis分析)和DFT计算,以获取机理上的见解,这表明可能涉及手性顺式-Fe V(O)2反应中间体作为活性氧化剂。这种顺式[Fe II(手性N 4配体)] 2+ / H 2 O 2方法可能是现有OsO 4的可行绿色替代方法/补充方法基于方法的不对称烯烃二羟基化反应。