Journal
ORGANIC CHEMISTRY FRONTIERS
Volume 8, Issue 4, Pages 784-791Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qo01335h
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Funding
- National Key R&D Program of China [2018YFC0807301-3]
- National NSFC [21871252, 21801024, 21801026, 21901024]
- Material Evidence Identification Center of Ministry of Public Security [2019CSEEKFKT06]
- Start-up Fund of Chengdu University [2081919035]
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This new method allows for the synthesis of 4-aminoquinolin-2-ones and N-Cbz-N '-arylureas via ring expansion and opening pathways, with good to excellent yields.
A divergent method for ring expansion and ring opening of 3-halooxindoles has been developed. Under mild base-mediated conditions, 3-halooxindoles generate indolones in situ, which then react smoothly with N-alkoxycarbonyl-O-tosylhydroxylamines to give 4-aminoquinolin-2-ones and N-Cbz-N '-arylureas in good to excellent yields via ring expansion and opening pathways, respectively. This protocol is characterized by easy availability of substrates, user-friendly reaction conditions, broad functional group tolerance, and a simple operation procedure.
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