Isomerization of all-(<i>E</i>)-Retinoic Acid Mediated by Carbodiimide Activation - Synthesis of ATRA Ether Lipid Conjugates
作者:Mikkel S. Christensen、Palle J. Pedersen、Thomas L. Andresen、Robert Madsen、Mads H. Clausen
DOI:10.1002/ejoc.200901128
日期:2010.2
1-O-hexadecyl-sn-phosphatidylcholine with all-(E)-retinoic acid, DCC and DMAP resulted in poor acylation and caused (Z)/(E) isomerization of the α–β 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.