Process for preparing derivatives of naphthazarin

Details Process for preparing derivatives of naphthazarin Process for preparing derivatives of naphthazarin

1986-04-30

1987-03-17

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549472, C07D30712

Patent

active

046508856

ABSTRACT:
A process is provided for preparing a derivative of naphthazarin represented by the general formula (I) of: ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 each stands for an atom or a group consisting of hydrogen, a hydroxyl group, organic residues and halogens; and R.sub.1 to R.sub.6 each stands for an atom or a group selected from the group consisting of hydrogen and hydrocarbon groups. The derivative of naphthazarin is prepared by the step of reacting, in the presence of an acid catalyst, the following compounds represented by the general formulae (II) and (III): ##STR2## wherein R is an atom or a group selected from the group consisting of hydroxyl, oxyhydrocarbon, siloxy and acyloxy groups and halogen atoms.

REFERENCES:
Chem. Pharm. Bull., vol. 29 (1981) pp. 116-122.

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