期刊
ORGANIC LETTERS
卷 18, 期 15, 页码 3710-3713出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.6b01743
关键词
-
资金
- Czech Science Foundation [14-09190S]
- Ministry of Education, Youth and Sports of the Czech Republic [20-SVV/2016]
Two new photocatalytic systems based on flavinium species formed in situ by protonation of riboflavin-tetraacetate (1) with triflic acid or prepared in advance via alloxazine quaternization are presented as effective tools for oxidative cyclobutane ring [2 + 2] cycloreversion using visible light. The system with 1,3-dimethyl-8-trifluoromethylalloxazinium perchlorate (2c) was found to be superior allowing an acid-free mild procedure, which results in the opening of cyclobutanes with high oxidation potential (up to 2.14 V) and/or with sensitive groups (e.g., furan) without side reactions.
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