Archiv der Pharmazie p. 569 - 572 (1989)
Update date:2022-08-17
Topics:
Wurm, Gotthard
Goessler, Bernd
The methylnaphthol derivatives 9 and 10 are suitable compounds for the synthesis of plumbagin, 6-methyljuglone (14) and 3-methylnaphthazarine (12). 9 and 10 are derived from 5 and 6 which are synthesized by formylation of the naphthols 2 and 3.As it was not possible to get the formylnaphthol 8 in the same way, isoplumbagin (18) was prepared by bromine-lithium exchange in the key compound 16 followed by methylation and oxidation.
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