期刊
ACS CATALYSIS
卷 11, 期 24, 页码 14829-14835出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c04460
关键词
nitro group; asymmetric catalysis; nitration; oxindoles; nickel
资金
- National Natural Science Foundation of China [21901142]
- Natural Science Foundation of Shandong Province [ZR2019QB001]
- Fundamental Research Funds of Shandong University [21310088963023, 2020QNQT007, 2020QNQT009]
This study reports a nickel-catalyzed asymmetric nitration reaction that successfully synthesized chiral oxindoles with a tertiary nitro group in good yields and high enantioselectivities. The resulting products can be used for the synthesis of chiral 3-amino oxindoles and demonstrate the synthetic potential for analogues of the antimalarial agent Cipargamin.
The efficient stereoselective nitration of sp(3) carbons, especially in an asymmetric manner, remains a formidable challenge. Here we report an example of nickel-catalyzed asymmetric nitration reaction, delivering chiral oxindoles bearing a tertiary nitro group in good yields with high enantioselectivities (up to 83% yield and 95% ee). Diverse enantioenriched 3-nitro oxindoles were prepared from readily available oxindoles efficiently, benefiting the synthesis of chiral 3-amino oxindoles. Notably, the synthetic potential of this asymmetric nitration method was further demonstrated by constructing analogues of Cipargamin, a potent antimalarial agent. Preliminary mechanistic studies supported a radical process involved in this transformation.
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