Abstract
Treatment of the lysolipid 1-O-hexadecyl-sn-phosphatidylcholine with all-(E)-retinoic acid, DCC and DMAP resulted in poor acylation and caused (Z)/(E) isomerization of the alpha-beta double bond. In the presence of a proton source, the carbodiimide-activated all-(E)-retinoic acid undergoes fast isomerization to give a final mixture of (13E)/(13Z) isomers in a 3:1 ratio. Similar treatment of (13Z)-retinoic acid leads to the same isomer ratio. The isomerization was circumvented successfully by using a Mitsunobu reaction, which provided an efficient synthesis of all-(E)-retinoic acid sn-2-conjugated to phosphatidylcholine and phosphatidylglycerol etherlipids.
Original language | English |
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Journal | European Journal of Organic Chemistry |
Issue number | 4 |
Pages (from-to) | 719-724 |
ISSN | 1434-193X |
DOIs | |
Publication status | Published - 2010 |
Keywords
- Retinoic acid
- Acylation
- Isomerization
- Mitsunobu reaction
- Phospholipids