Synthetic Studies in the Intramolecular Carbocyclization of <i>N</i>-Acyloxyiminium Ions. Stereoelectronic and Steric Implications of Nucleophilic Alkene, Alkyne, and Allene Tethers
作者:Stephen Hanessian、Martin Tremblay、Mauro Marzi、Juan R. Del Valle
DOI:10.1021/jo050326w
日期:2005.6.1
acid mediated carbocyclization to give stereodefined azacyclic compounds depending on the nature of the nucleophilic tether. In general, reactions of alkenes and alkynes with terminal alkyl or aryl substituents, as well as allenes, proceed through transient vinylic carbocations that are attacked internally by the N-Boc group to give tricyclic dihydrooxazinones. Diastereotopic bis-4-(3-butenyl) and 4-(3-butynyl)