منابع مشابه
Free Radical Cyclizations, Xvii. Mechanistic Studies
Free radical cyclizations of the 4-phenylbutyl radical and analogues carrying naphthyl and vinyl groups instead of phenyl have been studied. A typical reaction scheme is given below involving closures to fiveand six-membered rings. Competition rate studies for the various types of ring closure were performed with deuterated analogues. The results can be used as an efficient mechanistic tool for...
متن کاملSelf-terminating, oxidative radical cyclizations.
The recently discovered novel concept of self-terminating, oxidative radical cyclizations, through which alkynes can be converted into carbonyl compounds under very mild reaction conditions using O-centered inorganic and organic radicals as oxidants, is described.
متن کامل[Synthesis of alkaloids using radical cyclizations].
This review deals with the synthesis of alkaloids using radical cyclizations. Emphasis has been placed on radical cascades that provide synthesis of (-)-cephalotaxine, (±)-stemonamide, and (±)-isostemonamide.
متن کاملRadical cyclizations involving the evolution of nitrogen
The rsuiical cyclizations of N-aziridinyl imines and alkyl azides provided reliable methods for the formation of fiveand six-membered carbon-centered and nitrogen-centered radicals from acyclic precursors. NAziridinyl imino and azido groups were utilized as radical precursors as well as radical acceptors in radical cyclization. Furthermore, intramolecular addition of aminyl radicals to carbonyl...
متن کاملPhotochemical aryl radical cyclizations to give (E)-3-ylideneoxindoles.
(E)-3-Ylideneoxindoles are prepared in methanol in reasonable to good yields, as adducts of photochemical 5-exo-trig of aryl radicals, in contrast to previously reported analogous radical cyclizations initiated by tris(trimethylsilyl)silane and azo-initiators that gave reduced oxindole adducts.
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ژورنال
عنوان ژورنال: Accounts of Chemical Research
سال: 1971
ISSN: 0001-4842,1520-4898
DOI: 10.1021/ar50047a005