The efficient synthesis of 3-, 4-, and 5-O-feruloylquinic acids starting from D-(-)-quinic acid is described. Esterification of suitably protected quinic acid derivatives with 3-(4-acetoxy-3-methoxyphenyl)-acryloyl chloride and subsequent hydrolysis of all the protecting groups afforded the title products in overall yields of 33%, 15%, and 45%, respectively, (from quinic acid). (C) 2013 Elsevier Ltd. All rights reserved.
All four regioisomers of feruloyl quinic acid and isoferuloyl quinic acid were synthesized and a liquid chromatography/tandem massspectrometry (LC/MS/MS) method developed that resolves all eight regioisomers. All eight regioisomers can be readily distinguished by their MS/MS spectra in the negative ion mode, illustrating the power of tandem massspectrometry to elucidate the structures of regioisomeric