期刊
CHINESE CHEMICAL LETTERS
卷 31, 期 3, 页码 701-705出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.08.049
关键词
Borrowing hydrogen; Dehydrogenation; Non-coordinating anion; Iridium; Bisamides
资金
- National Natural Science Foundation of China [21776111, 21861039]
- Fundamental Research Funds for the Central Universities [JUSRP 51627B]
- Ministry of Education and the State Administration of Foreign Experts Affairs for the 111 Project [B13025]
Several novel pyridine-oxadiazole iridium complexes were synthesized and characterized through X-ray crystallography. The designed iridium complexes revealed surprisingly high catalytic activity in C-N bondformation of amides and benzyl alcohols with the assistance of non-coordinating anions. In an attempt to achieve borrowing hydrogen reactions of amides with benzyl alcohols, N,N'-(phenylmethylene)dibenzamide products were unexpectedly isolated under non-coordinating anion conditions, whereas N-benzylbenzamide products were achieved in the absence of non-coordinating anions. The mechanism explorations excluded the possibility of silver effect (silver-assisted or bimetallic catalysis) and revealed that the reactivity of iridium catalyst was varied by non-coordinating anions. This work provided a convenient and useful methodology that allowed the iridium complex to be a chemoselective catalyst and demonstrated the first example of non-coordinating-anion-tuned selective C-N bond formation (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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