13C NMR spectral assignment of five epimeric 3α- versus 3β-functionalized cholestane pairs
13C NMR chemical shift assignments of five α- and β-epimeric pairs of cholestanes functionalized at C-3 are presented. Empirical increment estimations proved to be a valuable tool for the unequivocal structural elucidation when compared with th
Ramos,Santos,Almeida,Motherwell,Costa
p. 861 - 863
(2007/10/03)
Steroidal derived acids as inhibitors of human Cdc25A protein phosphatase
A group of steroidal derived acids were synthesized and found to be human Cdc25A inhibitors. Their potency ranged from 1.1 to > 100 μM; the best ones compare very favorably with that of the novel cyano-containing 5,6-seco- cholesteryl acid 1 (IC50/s
Peng, Hairuo,Xie, Wenge,Kim, Deog-Il,Zalkow, Leon H.,Powis, Garth,Otterness, Diane M.,Abraham, Robert T.
p. 299 - 306
(2007/10/03)
Reduction et photoreduction de derives de l'acide carbonique influence de l'hexamethylphosphorotriamide
Photoreduction and reduction of carbonic acid derivatives in HMPT have been compared.The highest yield of alkane was obtained from N,N-dimethylthiocarbamates either by the photochemical method or by reduction with a dissolved metal.Competitive reactions have been characterized: - during the photoreduction not only the alkane but products of a photo-Fries rearrangement and products of a homolytic cleavage were detected; - basic reactions can compete with the reduction of carbonic acid derivatives by sodium in HMPT.
Dembele, Albert,Deshayes, Henri,Pete, Jean-Pierre
p. 671 - 680
(2007/10/02)
ORGANOTELLURINIC ACID ANHYDRIDES AS SELECTIVE OXIDANTS IN ORGANIC SYNTHESIS
Several aryltellurinic acid anhydrides have been compared for their oxidising properties in acetic acid.Very high yields of quinones and disulphides can be obtained under conditions where phenols are not oxidised.
Barton, Derek H. R.,Finet, Jean-Pierre,Thomas, Martial
p. 2319 - 2324
(2007/10/02)
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