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Complementing Pyridine-2,6-bis(oxazoline) with Cyclometalated N-Heterocyclic Carbene for Asymmetric Ruthenium Catalysis.
Angewandte Chemie International Edition ( IF 16.6 ) Pub Date : 2020-05-12 , DOI: 10.1002/anie.202004243
Long Li 1 , Feng Han 1 , Xin Nie 1 , Yubiao Hong 1 , Sergei Ivlev 1 , Eric Meggers 1
Affiliation  

A strategy for expanding the utility of chiral pyridine‐2,6‐bis(oxazoline) (pybox) ligands for asymmetric transition metal catalysis is introduced by adding a bidentate ligand to modulate the electronic properties and asymmetric induction. Specifically, a ruthenium(II) pybox fragment is combined with a cyclometalated N‐heterocyclic carbene (NHC) ligand to generate catalysts for enantioselective transition metal nitrenoid chemistry, including ring contraction to chiral 2H‐azirines (up to 97 % ee with 2000 TON) and enantioselective C(sp3)−H aminations (up to 97 % ee with 50 TON).

中文翻译:

用环金属化 N-杂环卡宾补充吡啶-2,6-双(恶唑啉),用于不对称钌催化。

通过添加双齿配体来调节电子性质和不对称诱导,提出了扩大手性吡啶-2,6-双(恶唑啉)(pybox)配体在不对称过渡金属催化中的应用的策略。具体来说,钌 (II) pybox 片段与环金属化 N-杂环卡宾 (NHC) 配体结合,生成用于对映选择性过渡金属氮烯化学的催化剂,包括环收缩为手性 2H-氮丙啶(2000 TON 时高达 97% ee)和对映选择性 C(sp 3 )−H 胺化(50 TON 时高达 97 % ee)。
更新日期:2020-07-13
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