Organic compounds -- part of the class 532-570 series – Organic compounds – Cyclopentanohydrophenanthrene ring system containing
Reexamination Certificate
2011-07-05
2011-07-05
Badio, Barbara P (Department: 1628)
Organic compounds -- part of the class 532-570 series
Organic compounds
Cyclopentanohydrophenanthrene ring system containing
Reexamination Certificate
active
07973185
ABSTRACT:
The invention relates to a process for the preparation of a phenolic hydroxy-substituted compound of the general formula (I) by desalkylation of an alkyl aryl ether of the general formula (II) by treatment with a thiourea/aluminum chloride reagent pair, in said general formulae R1stands for straight chain or branched C1-6alkyl group; R2, R3, R4, R5, and R6have the same or different meanings and stand for hydrogen or halogen atom, hydroxy, carboxy, nitro, oxo, C1-6alkylcarbonyl, straight chain or branched alkyl or -alkoxy, or aryl group, or R2and R3together stand for a 5-7 membered ring or fused ring system; said 5-7 membered ring may be a partially saturated ring optionally substituted with an oxo group or can be an unsaturated ring; or said fused ring system may constitute with the first ring a steroid, preferably an estratriene derivative optionally substituted with an oxo or C1-6alkylcarbonyloxy group in the 17 position.
REFERENCES:
patent: 4339614 (1982-07-01), Olah
Node, M. et al., Hard Acid and Soft Nucleophile System . . . , J. Org. Chem., 1980, vol. 45, pp. 4275-4277.
Borbély László
Dudás József
Haász Ferenc
Jekkel Péter
Vass András
Badio Barbara P
Richter Gedeon Nyrt.
Voight Jason D.
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