期刊
ORGANIC LETTERS
卷 15, 期 15, 页码 3820-3823出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol401338e
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资金
- National Nature Science Foundation of China [20872056, J0730425]
An efficient synthesis of quinoxalin-2(1H)-ones or spiro[cyclohexene-1,2'-imidazol]-4'-cones has been achieved in moderate to high yields by the visible light-induced and N-bromosuccinimide-mediated cyclization reaction of 2-azido-N-phenylacetamides at ambient temperature. Both the regioselectivity and the speed of cyclization are affected by the substituents attached to the phenyl ring. For example, quinoxalin-2-ones are produced as the main products when the substrates bear electron-withdrawing groups at the para-position of the phenyl ring; in contrast, spiro[cyclohexene-1,2'-imidazol]-4'cones are obtained as the main products when the substrates bear electron-donating groups at the para-position.
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