Synthesis of phosphoric acid diesters of 7β- hydroxycholesterol and of carbohydrates
作者:Xavier Pannecoucke、Gaby Schmitt、Bang Luu
DOI:10.1016/s0040-4020(01)89687-3
日期:——
phosphoramidite method (with protected C-1, 2, 3, 4 hydroxyl groups for the carbohydrates). As the protection of the sugars increased the length of the synthesis, we decided to use the hydrogen-phosphonate methodology which leads to a selective phosphorylation at the primaryalcohol of carbohydrates and avoids the use of protected carbohydrates. Compound 2 was synthesized in good yield. However compound 1, probably
In order to enhance the therapeutic efficacy of azido-thymidine (AZT) by improving its pharmacokinetic properties and to try to target its action to the lymphocytes, the phosphodiester of 3 beta(7 beta-hydroxycholesterol) and of 5'(3'deoxy, 3'azido-thymidine) 1 was synthesized using two different techniques of phosphorylation : the phosphoramidite and the hydrogen phosphonate methodologies. Preliminary results show an in vitro anti-HIV activity.
Mass spectrometric studies of phosphodiesters linked to oxysterols and nucleosides, a family of biologically potent oxygenated sterols
作者:Xavier Pannecoucke、Alain Van Dorsselaer、Bang Luu
DOI:10.1002/oms.1210270214
日期:1992.2
AbstractNegative‐ion fast atom bombardment mass spectra of five compounds resulting from combinations between oxysterols and nucleoside analogues linked by phosphodiester bonds are presented and interpreted. This method seems to be the most appropriate for elucidating the structure of these complex, labile and non‐volatile phosphate‐containing molecules which exhibit important antitumour and/or immunosuppressive activities.
Application of the phosphoramidite-phosphite triester approach for the synthesis of combinations between oxygenated sterols and nucleoside analogues linked by phosphodiester bonds
作者:Yu-hua Jl、Willi Bannwarth、Bang Luu
DOI:10.1016/s0040-4020(01)85432-6
日期:1990.1
synthesis seems to be the technique of choice for the preparation of labile multifunctional compounds linked by phosphodiester bonds in solution. Thus, to make the lipophilic oxysterols water-soluble for biologicalstudies, we have prepared several combinations between polyoxygenated sterols and nucleoside analogues using Cβ-cyanoethoxy)bis(diisopropylamine) phosphine 2 as phosphorylating agent. This approach