Process for producing rhein and diacerhein

Details Process for producing rhein and diacerhein Process for producing rhein and diacerhein

1997-07-31

1999-11-16

Lambkin, Deborah C.

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

Organic compounds

Carboxylic acids and salts thereof

560254, C07C 5976, C07C 6702

Patent

active

059861290

ABSTRACT:
The following description sets forth a process for producing rhein, diacerhein and other diacyl derivatives thereof, which comprises the following steps: treatment of a diphenylketone ##STR1## in which R.sub.1 is --OR', --NR'R", --SR', where R' and R" are H, an alkyl or aromatic group; R.sub.2 is H or a protective group, R.sub.3 is --OH or C.sub.1 -C.sub.4 alkyl, with an acid or superacid to give a 1-aminoanthraquinone derivative, diazotisation, replacement of the --NH.sub.2 group by --OH, optional removal of the protective group, and acylation.

REFERENCES:
patent: 3089879 (1963-05-01), Serres, Jr. et al.
patent: 4346103 (1982-08-01), Friedmann
patent: 5066820 (1991-11-01), Helwig et al.
patent: 5652265 (1997-07-01), Vittori et al.

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