期刊
CHEMPLUSCHEM
卷 86, 期 5, 页码 741-744出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.202100089
关键词
[4+2] cycloaddition reactions; halogen bonding; homogeneous catalysis; hypervalent iodine; indoles
资金
- Grants-in-Aid for Scientific Research [19H02709] Funding Source: KAKEN
- JSPS KAKENHI [19H02709] Funding Source: Medline
The stable hypervalent cyclic dibenzoiodolium salt acts as a strong halogen bonding donor catalyst for [4+2] cycloaddition reactions, rather than an oxidizing agent. This catalyst is effective in promoting both [4+2] cycloaddition reactions of 2-alkenylindoles and Povarov reactions with high yields.
A stable, hypervalent cyclic dibenzoiodolium salt acted as a strong halogen bonding (XB)-donor catalyst for [4+2] cycloaddition of 2-alkenylindoles, and not as an oxidizing agent. The cross-[4+2] cycloaddition of 2-vinylindoles with 2-alkenylindoles was catalyzed smoothly by the hypervalent cyclic dibenzoiodolium triflate catalyst to give the tetrahydrocarbazoles in up to 99 % yield with 17 : 1 diastereoselectivity. The hypervalent cyclic dibenzoiodolium salt was also applicable to the Povarov reaction of 2-vinylindole with N-p-methoxyphenyl (PMP) imine to give the indolyl-tetrahydroquinoline in 83 % yield.
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