期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 79, 期 10, 页码 4676-4686出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo500730y
关键词
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资金
- Ministry of Science and Technology of China [2012CB822100, 2013CB910700, 2012ZX09502001-001]
- National Natural Science Foundation of China [21232002]
- Beijing Higher Education Young Elite Teacher Project [YETP0063]
A new ring-opening-ring closure strategy for the synthesis of aryl-C-glycosides was described. This strategy exploited the nickel-catalyzed regioselective beta-O elimination of glycals by reactions with various aryl boronic acids or potassium aryltrifluoroborates to yield the ring-opened products, which underwent the Lewis acid, protonic acid, PhSeCl, or NBS mediated ring closure reactions to afford diverse aryl-C-glycosides. After Lewis acids and protonic acids were screened, it was found that, starting from the ring-opened substrates, the Ph3PHBr or Sc(OTf)(3) mediated ring closure reaction provided alpha-or beta-preferred aryl-C-Delta(2,3)-glycosides, respectively. Furthermore, beta-D-phenyl-C-glycosides were successfully prepared via the PhSeCl-mediated cyclization reaction, whereas the alpha-D-phenyl-C-glycoside was obtained via the NBS-mediated cyclization reaction. After removal of the 2-substituted functionalities by Bu3SnH/AIBN, the synthesis of 2-deoxy-aryl-C-glycosides was ultimately realized in a stereoselective manner.
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