BIS(FLUOROALKOXY)TRIPHENYLPHOSPHORANES: PREPARATION AND REACTIONS
作者:Toshio Kubota、Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1978.889
日期:1978.8.5
Bis(fluoroalkoxy)triphenylphosphoranes were prepared by the replacement of bromines of triphenylphosphine dibromide by fluoroalkoxides [C6H5C(CF3)2ONa, and CF3CH2ONa]. Alcohols and carboxylic acids readily reacted with Ph3P(OCH2CF3)2 to form corresponding 2,2,2-trifluoroethyl ethers and esters, respectively. Ph3P(OC(CF3)2C6H5]2, however, was so stable that it did not undergo reactions with these hydroxyl
Chemoenzymatic Synthesis of Lysophosphatidylnucleosides
作者:Rosa Chillemi、Domenico Russo、Sebastiano Sciuto
DOI:10.1021/jo971826v
日期:1998.5.1
5'-O-Lysophosphatidylnucleosides [5'-O-(1-O-acyl-sn-glycero-3-phosphoryl)nucleosides] were obtained by a two-step chemoenzymatic synthesis. 5'-O-(sn-Glycero-3-phosphoryl)nucleosides (5'-GPNs) were first prepared from a phosphoramidite of 1,2-O-isopropylidene-sn-glycerol and appropriately protected nucleosides, applying the phosphoramidite methodology on the solid phase or in solution. In a following step, the regioselective acylation at the C-l hydroxyl of the glycerol moiety of 5'-GPNs was achieved by a lipase-catalyzed transacylation with activated fatty acid esters in organic solvent. Some deoxyribo- and ribonucleosides, as well, were converted into the corresponding lysophosphatidyl derivatives utilizing either saturated or unsaturated fatty acid esters with different length alkyl chains. The synthesis was also applied to the preparation of O-(1-O-palmitoyl-sn-glycero-3-phosphoryl) conjugates of Acyclovir and AZT, of potential pharmacological interest.
KUBOTA TOSHIO; MIYASHITA SATOSHI; KITAZUME TOMOYA; ISHIKAWA NOBUO, J. ORG. CHEM., 1980, 45, NO 25, 5052-5057