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Selective etherification of the 3-hydroxy group of 1,3-dihydroxy-l0-methyl-9(10H)-acridinone (la) gave the ethers l c -e. Cyclodehydration of l c yielded a mixture of furacridone (2) and 3a in a ratio of about 6: 1. Claisen rearrangement or cyclization of Id and l e in N,N-diethylaniline led to the isomeric mixtures l i and l h as well as 4 and 5 in ratios of 5 : 1 and 6: 1 , respectively, in favour of the C-6substitution. By rearrangement of l e in HMPT the linear 3b has been obtained. Ein allgemeiner Syntheseweg zu Furo-(bzw . Pyrano-)acridonen fuhrt iiber zur Cyclisation befahigte C-3-Ether von l a , wobei die neue C,C-Verknupfung am c-4 oder c-2 Aus Wurzelrinde von

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