The Sulfinyl Group as a Remote Chiral Auxiliary in Stereoselective Conjugate Additions of Alkyl Groups to α-Methylidene Carbonyl Compounds Initiated by Et<sub>3</sub>B/O<sub>2</sub>
作者:José Antonio Fernández-Salas、M. Carmen Maestro、M. Mercedes Rodríguez-Fernández、José L. García Ruano
DOI:10.1002/ejoc.201201642
日期:2013.3
l] α-methylidene carbonyl compounds 1 and 2 with alkyl radicals generated from Et3B/O2 and RI give, after protonation, β-alkyl derivatives with a high degree of control of the configuration at the α carbon. In the case of aldehyde 2, when further combined with allylation of the carbonyl group, a one-pot radical-addition/protonation/allylation sequence provides a highly stereoselective synthesis of
Remote Stereocontrol Mediated by a Sulfinyl Group: Synthesis of Allylic Alcohols via Chemoselective and Diastereoselective Reduction of γ-Methylene δ-Ketosulfoxides
作者:José L. García Ruano、M. Ángeles Fernández-Ibáñez、José A. Fernández-Salas、M. Carmen Maestro、Pablo Márquez-López、M. Mercedes Rodríguez-Fernández
DOI:10.1021/jo802378s
日期:2009.2.6
diastereoselectivity of the reduction of α,β-unsaturated α-[2-(p-tolylsulfinyl)phenyl] substitutedketones 1 has been demonstrated in reactions carried out under NaBH4 in the presence of Yb(OTf)3 as the chelating agent. The starting unsaturated ketones have been prepared from the corresponding 2-(p-tolylsulfinyl) benzyl alkyl (and aryl) ketones 2 by insertion of the methylidene group under modified Mannich conditions