Enantioselective Synthesis of (+)- and (−)-Dihydroepiepoformin and (+)-Epiepoformin
作者:M. Carmen Carreño、Estíbaliz Merino、María Ribagorda、Álvaro Somoza、Antonio Urbano
DOI:10.1021/ol050287a
日期:2005.3.1
[reaction: see text] The enantioselective synthesis of both enantiomers of dihydroepiepoformin (1) and (+)-epiepoformin (2) was achieved from (p-tolylsulfinyl)methyl-p-quinols (SR)- or (SS)-3 and (4R,SR)-4, respectively. Key features include the stereocontrolled conjugate addition of AlMe3 to p-quinol 3 and retrocondensation to the ketone functionality, previous to oxidation of the beta-hydroxy sulfoxide
β-Hydroxysulfoxides as chiral cyclic ketone equivalents: enantioselective synthesis of polysubstituted cyclohexanones, cyclohexenones and cyclohexenediones
作者:M. Carmen Carreño、Manuel Pérez-González、María Ribagorda、Álvaro Somoza、Antonio Urbano
DOI:10.1039/b209121f
日期:——
The β-hydroxysulfoxide moiety, after oxidation to sulfone, acts as a masked carbonyl group in a cyclic system, opening an easy access to differently substituted enantiomerically pure cyclic ketones by means of aluminium-mediated conjugate additions, stereoselective reductions and elimination by retrocondensation in basic medium.