Alkali Base-Initiated Michael Addition/Alkyne Carbocyclization Cascades
作者:Christopher Kourra、Felix Klotter、Filippo Sladojevich、Darren J. Dixon
DOI:10.1021/ol2033674
日期:2012.2.17
A new cascade reaction involving an intramolecular Michael addition followed by an alkyne carbocyclization is presented. The reaction is promoted by a substoichiometric amount of KHMDS and represents one of the rare examples where the carbocyclization of an unactivatedalkyne is mediated by an alkali metal base, under mild conditions. The reaction allows the generation of functionally dense, stereochemically
The Radical Cyclization Approach to Morphine. Models for Highly Oxygenated Ring-III Synthons
作者:Kathlyn A. Parker、Demosthenes Fokas
DOI:10.1021/jo00093a027
日期:1994.7
4-Iodo-3-methyl-2-cyclohexenone (9) and 3-alkyl 3-cyclohexene-1,2-diol derivatives 16 were examined as ring-III equivalents for the tandem radical cyclization approach to the synthesis of morphine (1a).