Exploratory study on α-metallo selenones: original syntheses of oxaspiropentanes
作者:A. Krief、W. Dumont、J.L. Laboureur
DOI:10.1016/0040-4039(88)85138-4
日期:1988.1
Oxaspiropentanes have been obtained from α-metallocyclopropyl phenyl selenones and carbonyl compounds and on reaction of a base with β-hydroxyalkyl cyclopropyl selenones. The original reactivity of other β-hydroxyalkyl selenones is also disclosed.
Catalytic and Regioselective Ring Expansion of Arylcyclobutanones with Trimethylsilyldiazomethane. Ligand-Dependent Entry to β-Ketosilane or Enolsilane Adducts
作者:Jennifer A. Dabrowski、David C. Moebius、Andrew J. Wommack、Anne F. Kornahrens、Jason S. Kingsbury
DOI:10.1021/ol101136a
日期:2010.8.20
Divergent reactivity is uncovered in the homologation of arylcyclobutanones with trimethylsilyldiazomethane. With Sc(OTf)(3) as catalyst, enolsilanes are obtained with a high preference for methylene migration. By contrast, Sc(hfac)(3) gives beta-ketosilanes with both regio- and diastereocontrol. Each adduct affords the cyclopentanone upon hydrolysis.