Rearrangement of acyloxyoxiranes: A revised structure for the oxidation product of 5α-androst-16-ene-3α, 17-diol 3-benzoate 17-acetate
作者:Gottumukkala V. Subbaraju、Zofia Urbanczyk-Lipkowska、Sardar N. Newaz、Maghar S. Manhas、Ajay K. Bose
DOI:10.1016/s0040-4020(01)89038-4
日期:——
Rearrangement of acyloxyoxiranes to α-acyloxyketones, in situ, was observed. The α-ketoacetate structure assigned previously to the m-CPBA oxidation product of 5α-androst-16-ene-3α,17-diol 3-benzoate 17-acetate, has been revised to an acyloxyoxirane structure based on spectroscopic and X-ray diffraction data.
Aerobic Ru-Catalyzed Epoxidations in Fluorous Biphasic System Using New Fluorous Benzimidazolic Ligands
作者:Paul Knochel、Gianna Ragagnin
DOI:10.1055/s-2004-820042
日期:——
An efficient ruthenium catalyzed fluorous biphasic epoxidation of alkenes with oxygen in the presence of a pyridine-benzimidazole ligand bearing perfluorinated ponytails is described. Excellent yields and reaction rates were obtained and the fluorous phase could be recycled up to ten times without any loss of activity.