BAKOS, TAMAS;VINCZE, IREN, SYNTH. COMMUN., 19,(1989) N-4, C. 523-528
作者:BAKOS, TAMAS、VINCZE, IREN
DOI:——
日期:——
6-Oxoestradiols from Estradiols: Exploiting Site Selective Metalation of Aralkyl Systems with Superbases
作者:Rosanna Tedesco、Rita Fiaschi、Elio Napolitano
DOI:10.1055/s-1995-4136
日期:1995.12
3-O-Protected estradiol derivatives undergo metalation at C-6 when exposed to a fourfold excess of the reagent consisting of an equimolar mixture of lithium diisopropylamide and potassium 1,1-dimethylpropoxide (3 h, THF, -78°C). The metalated intermediates can be oxidized by quenching with trimethyl borate followed by treatment with hydrogen peroxide, thus allowing the introduction of a 6-hydroxy group into the estradiol framework. Further oxidation of the 6-hydroxy group gives O-protected 6-oxoestradiols.