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Rhodium(II)‐Catalyzed CH Insertions with {[(4‐Nitrophenyl)sulfonyl]imino}phenyl‐λ 3 ‐iodane
Author(s) -
Nägeli Ivo,
Baud Corine,
Bernardinelli GéErald,
Jacquier Yvan,
Moraon Mary,
Müllet Paul
Publication year - 1997
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19970800407
Subject(s) - chemistry , sulfonyl , nitrene , steric effects , rhodium , allylic rearrangement , catalysis , medicinal chemistry , migratory insertion , stereochemistry , insertion reaction , organic chemistry , alkyl
The [Rh 2 (OAc) 4 ]‐catalyzed decomposition of {[(4‐nitrophenyl)sulfonyl]imino}phenyl‐λ 3 ‐iodane (NsNIPh) resulted in formal insertions into CH bonds, activated by phenyl or vinyl groups, or by O‐substituents. Scope and limitations of the reaction were investigated. Yields of up to 84% were achieved in the most favorable cases. Yields were enhanced by electron‐releasing substituents and decreased by steric hindrance. Aziridination competed with allylic insertion with olefinic substrates. The insertion reaction proceeded with retention of configuration. With chiral Rh II catalysts, a modest asymmetric induction was observed. A mechanism involving direct insertion by a Rh‐complexed nitrene into the CH bond is proposed.