154461-64-0Relevant articles and documents
First diastereoselective synthesis of methyl caffeoyl- and feruloyl-muco-quinates
Jaiswal, Rakesh,Dickman, Michael H.,Kuhnert, Nikolai
, p. 5266 - 5277 (2012/08/08)
We report on a diastereoselective synthesis of six derivatives of caffeoyl- and feruloyl-muco-quinic acids. All the muco-quinic acid derivatives were obtained in excellent yield in five steps starting from quinic acid, caffeic acid and ferulic acid. Allyl ether protection of trans-hydroxy cinnamic acids was here introduced to chlorogenic acids synthesis. We show that muco-quinic acid derivatives, which are formally diastereoisomers of chlorogenic acids, can be readily distinguished by their tandem mass spectra. The Royal Society of Chemistry 2012.
How to identify and discriminate between the methyl quinates of chlorogenic acids by liquid chromatography-tandemmass spectrometry
Jaiswal, Rakesh,Kuhnert, Nikolai
experimental part, p. 269 - 281 (2011/10/12)
The methyl esters of chlorogenic acids, methyl quinates, are widely distributed in plant materials and frequently appear as extraction artifacts in plant samples. This is the first time when liquid chromatography-tandem mass spectrometry methods have been used for the identification and characterization of the methyl quinates. For this purpose, methyl quinates of mono caffeoylquinic acids and mono feruloylquinic acids were synthesized as authentic standards. The methyl quinates of mono and diacyl chlorogenic acids have shown characteristic fragmentation pattern in their tandem mass spectra. MS n+1 spectra of the methyl quinates of diacyl chlorogenic acids were identical to MSn spectra of mono acyl derivatives. These quinates do not produce any methyl quinate peak at m/z 205 if compared with quinic acid peak at m/z 191 in negative ion mode. In the MSn spectra of these quinates, cinnamic acid part or cinnamoyl part was detected as a base peak in negative ionmode. The retention time, order of elution and fragmentation pattern were completely different if compared with LC-MSn methods developed for chlorogenic acids. These LC-MSn methods have been applied for the identification and regioisomeric characterization of the methyl quinates of chlorogenic acids in mate tea and woodruff (Galium odoratum). Twomethyl caffeoylquinates (2 and 4) were identified asmethyl 3-caffeoylquinate andmethyl 5-caffeoylquinate. Copyright
A novel efficient and versatile route to the synthesis of 5-O-feruloylquinic acids
Smarrito, Candice Menozzi,Munari, Caroline,Robert, Fabien,Barron, Denis
scheme or table, p. 986 - 987 (2009/02/05)
A novel synthesis of 5-O-feruloylquinic acid, a polyphenolic compound found in coffee beans, and its methyl ester derivative has been optimized. The sequence involves 6 steps and is compatible with the preparation of potential human metabolites of these c
PHENOLIC CONSTITUENTS OF PHELLODENDRON AMURENSE BARK
Ida, Yoshiteru,Satih, Yohko,Ohtsuka, Masumi,Nagasao, Miki,Shoji, Junzo
, p. 209 - 216 (2007/10/02)
Glycosides of (+/-)-5,5'-dimethoxyariciresinol, 2-(p-hydroxy-phenyl)-ethanol and N-methylhigenamine were isolated from the dried bark of Phellodendron amurense, together with nine phenolic compounds.