Journal
ORGANIC LETTERS
Volume 23, Issue 5, Pages 1891-1897Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c00309
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Funding
- National Natural Science Foundation of China [21971261, 21801256, 81930098]
- Key Project of Chinese National Programs for Fundamental Research and Development [2016YFA0602900]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010624]
- Fundamental Research Funds for the Central Universities [19ykpy133, 20ykzd12]
- Natural Science Foundation of Guangdong Province [2017A030310511]
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A radical borylative cyclization method under metal-free conditions was developed for the efficient assembly of various types of borylated aza-arenes. The reaction exhibited mild conditions, good functional-group tolerance, and generally good efficiencies. The utility of the products was demonstrated, and the mechanism was discussed.
Borylated aza-arenes are of great importance in the area of organic synthesis. A radical borylative cyclization of isocyanoarenes with N-heterocyclic carbene borane (NHC-BH3) under metal-free conditions was developed. The reaction allows the efficient assembly of several types of borylated aza-arenes (phenanthridines, benzothiazoles, etc.), which are difficult to access using alternative methods. Mild reaction conditions, a good functional-group tolerance, and generally good efficiencies were observed. The utility of these products is demonstrated, and the mechanism is discussed.
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