Process for the preparation of cyclic diketones

Details Process for the preparation of cyclic diketones Process for the preparation of cyclic diketones

2005-02-15

2005-02-15

Tsang, Cecilia J. (Department: 1625)

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C568S307000, C568S375000, C568S376000

Reexamination Certificate

active

06855831

ABSTRACT:
The present invention relates to a process for the preparation of compounds of formula I:wherein the substituents are as defined in claim1,by conversion of a compound of formula II:reaction of that compound with a compound of formula IV:in-line-formulae description="In-line Formulae" end="lead"?X—C(O)—Q  (IV),in-line-formulae description="In-line Formulae" end="tail"?wherein X is a leaving group, to form a compound of formula V:and treatment of that compound in the presence of a base with catalytic amounts of cyanide ions.

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Ca 140:42184, “Preparation of herbicidally active nicotinoyl derivatives”, Luethy et. al., WO2003106448.

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