Summary
The condensation of 1: 2: 3: 5-tetrahydroxy benzene with anisoyl acetaldehyde takes place in an abnormal way and gives rise to 5: 7: 8-trihydroxy-4′-methoxy flavylium chloride. By using 2: 6-dibenzyloxy quinol, 5: 7-di-benzyloxy-6-hydroxy-4′-methoxy flavylium chloride is obtained and subsequent debenzylation yields carajurone hydrochloride; by the action of sodium acetate, the colour-base carajurone is obtained.
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Ponniah, L., Seshadri, T.R. A synthesis of carajurone hydrochloride. Proc. Indian Acad. Sci. 39, 45–52 (1954). https://doi.org/10.1007/BF03047124
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DOI: https://doi.org/10.1007/BF03047124