Process for the preparation of 2-benzoxazolones

Details Process for the preparation of 2-benzoxazolones Process for the preparation of 2-benzoxazolones

C - Chemistry, Metallurgy

07

D

260/311.1

C07D 263/58 (2006.01)

Patent

CA 1322373

A B S T R A C T A PROCESS FOR THE PREPARATION OF 2-BENZOXAZOLONES The invention relates to a process for the preparation of a 2-bezoxazolone of the formula Image (I) wherein X represents a halogen atom, an alkyl group of from one to ten carbon atoms or a group OR in which R represents an alkyl group of from one to ten carbon atoms, a cyano group or a trifluoromethyl group, and n is from 0 to 4, which comprises reacting an ortho-nitro- phenol of the formula Image (II) wherein X and n are as defined above, with carbon monoxide in the presence of a catalytic system comprising a) palladium and/or a palladium compound b) a ligand having the formula III Image (III) in which Z and Y represent the same or different bridging groups each of which has 3 or 4 atoms in the bridge, of which atoms at least two are carbon atoms and which groups Z and Y may be bound to each other by means of a connection other than that already formed by the carbon atoms shown in formula III and c) an anion of an acid having a pK of less than 2, except of a hydrohalogenic acid.

541596

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