The structurally related anthraquinones kermesic acid, laccaic acid D, and aloesaponarin-I and -II have been synthesised efficiently, key steps involving Diels–Alder additions and addition of 1,1-dimethoxyethene.
D. W. Cameron, G. I. Feutrill, P. G. Griffiths and D. J. Hodder, J. Chem. Soc., Chem. Commun., 1978, 688 DOI: 10.1039/C39780000688
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