The synthesis of kermesic acid and isokermesic acid derivatives and of related dihydroxyanthraquinones
作者:Stephen J. Bingham、John H. P. Tyman
DOI:10.1039/a704317a
日期:——
bis(quinone), Thiele acetoxylation of which gives after hydrolysis and permethylation, a mixture of derivatives of kermesic and isokermesic acids in equal proportions. The Diels–Alder addition of 3-chlorojuglone and 3-alkoxycarbonyl-2,4-bis(trimethylsilyloxy)penta-1,3-dienes has led to an improved synthesis of aloesaponarin-I (3,8-dihydroxy-2-methoxycarbonyl-1-methylanthra-9,10-quinone), while juglone itself affords