New optically pure dimethylacetals of glyceraldehydes and their application for lipid and phospholipid synthesis
摘要:
A convenient synthesis of new and enantiomerically pure 2-O-protected D-glyceraldehyde dimethylacetals as chiral C-3 building blocks for the synthesis of lipids and phospholipids is described. Benzyl- or allylethers are used as protecting groups in position 2 and 5 of D-mannitol. These intermediates are converted to 2-O-benzyl- or 2-O-allyl-D-glyceraldehyde dimethylacetals by cleavage with periodic acid in methanol. The two dimethylacetals are useful for the synthesis of mixed chain phospholipids with natural configuration of ester-ester, ester-ether or ether-ether composition. Also, triglycerides with three different alkyl chains, ester or ether, can be prepared. As an example of the versatility of the new intermediates, we describe the synthesis of 1-O-hexahecyl-2-O-acetyl-sn-glycero-3-phosphocholine, the so-called 'platelet activating factor' (PAF), via 1-O-hexadecyl-2-O-benzyl-sn-glycerol.
opposite configuration at the diacyl glycerolmoiety, were also synthesized. The biological activities of the synthesized compounds were elucidated with cytokine inductions (IL-6 and TNF-α). A synthetic phosphoglycolipid with a natural-type diacyl glycerolconfiguration showed apparent immunostimulatory activity, whereas its diastereomer did not. The present study revealed that the configuration at the
New optically pure dimethylacetals of glyceraldehydes and their application for lipid and phospholipid synthesis
作者:Ulrich Massing、Hansjörg Eibl
DOI:10.1016/0009-3084(95)02445-o
日期:1995.6
A convenient synthesis of new and enantiomerically pure 2-O-protected D-glyceraldehyde dimethylacetals as chiral C-3 building blocks for the synthesis of lipids and phospholipids is described. Benzyl- or allylethers are used as protecting groups in position 2 and 5 of D-mannitol. These intermediates are converted to 2-O-benzyl- or 2-O-allyl-D-glyceraldehyde dimethylacetals by cleavage with periodic acid in methanol. The two dimethylacetals are useful for the synthesis of mixed chain phospholipids with natural configuration of ester-ester, ester-ether or ether-ether composition. Also, triglycerides with three different alkyl chains, ester or ether, can be prepared. As an example of the versatility of the new intermediates, we describe the synthesis of 1-O-hexahecyl-2-O-acetyl-sn-glycero-3-phosphocholine, the so-called 'platelet activating factor' (PAF), via 1-O-hexadecyl-2-O-benzyl-sn-glycerol.