An effective reagent to functionalize alcohols with phosphocholine
作者:Lianyan L. Xu、Lawrence J. Berg、D. Jamin Keith、Steven D. Townsend
DOI:10.1039/c9ob02582k
日期:——
Phosphocholine is a small haptenic molecule that is both a precursor and degradation product of choline. Phosphocholine decorates a number of biologics such as lipids and oligosaccharides. In this study, an air and bench stable phosphocholine donor has been developed and evaluated with a number of alcohol acceptors. Using a one-pot, three-step sequence, (phosphitylation, oxidation, and phosphate deprotection)
On the synthesis of platelet-activating factor via acetylation of 1-alkyl-sn-glycero-3-phosphocholine. Formation of structural isomer of PAF in the presence of bases
shown that platelet-activatingfactor (PAF) specimens prepared viaacetylation of 1-alkyl-sn-glycero-3-phosphocholine (lyso-PF) with acetic anhydride are heterogeneous. The contaminated compound was isolated and identified to be the structuralisomer of PAF, 1-alkyl-3-acetyl-sn-glycero-2-phosphocholine (iso-PAF). It appeared, that iso-PAF is formed when performing the reaction in the presence of organic
Two platelet activating factors (PAF) were conveniently prepared from optically active epichlorohydrin via 5 steps in 15–16% total yield. Four analogues containing oleoyl, propyl, p-trifluoromethylphenoxy, and N,N-dimethyldithiocarbamoyl groups were also prepared.
Acetyl glyceryl ether phosphorylcholines (platelet-activating factors ; PAFs), their enantiomers, and their analogues were efficiently synthesized in a stereochemically unambiguous manner starting from D-and L-tartaric acids as chiral synthons. The enantiomer of C16-PAF (S-comfiguration) showed far less activity than the natural PAF (R-configuration), and the N-methylpiperidine and N-methylpyrrolidine analogues were found to possess much higher activity than natural C16-PAF.
Acetyl glyceryl ether phosphorylcholines, platelet-activating factors (1 and 2), were efficiently synthesized in a stereochemically unambiguous manner starting from D- and L- tartaric acids as the chiral synthons.