Journal
TETRAHEDRON LETTERS
Volume 54, Issue 22, Pages 2865-2869Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2013.03.100
Keywords
Anthocyanin; Cyanidin-3-glucoside; Chemical synthesis; Methylation; Metabolites
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Funding
- FCT [SFRH/BPD/72652/2010, PTDC/AGR-TEC/2227/2012]
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Anthocyanins are natural polyphenolic compounds with important biological properties. In humans, these compounds are metabolized into different derivatives namely methyl, glucuronyl, and sulfate conjugates. Among these, cyanidin-4'-O-methyl-3-glucoside, already detected in vivo, seems to be an interesting metabolite to be used as standard for biological studies. The lack of suitable standards is a major drawback in biological studies. Bearing this in mind, this work describes a strategy for the chemical synthesis of cyanidin-4'-O-methyl-3-glucoside 9, which involved in the synthesis of the 'Western' and 'Eastern' molecules, namely 2,4-diacetoxy-6-hydroxybenzaldehyde 2 and 2-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyloxy)-3'-benzyloxy-4'-methoxyacetophenone 8, respectively. The final step consisted in the Robinson's acidic aldol condensation between 2 and 8 molecules, which after the respective deprotections yield product 9. (C) 2013 Elsevier Ltd. All rights reserved.
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