Phosphorus oxychloride → HCID 68980960, compound

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Reaction Steps

In another embodiment of the present invention there is provided a process for the preparation of a compound according to formula III wherein R2 is 3,5-dicyano-phenyl which process further comprises (i) contacting sodium 3,5-bis-tert-butylcarbamoyl-phenolate with 2,3,4-trifluoronitrobenzene in an appropriate solvent at temperatures from about −30° C. up to about 40° C. to afford a 3,4-difluoro-2-(3,5-bis-tert-butylcarbamoyl-phenoxy)nitrobenzene; and (ii) contacting 3,4-difluoro-2-(3,5-bis-tert-butylcarbamoyl-phenoxy)nitrobezene with phosphorus oxychloride or a similar dehydrating agent to afford 3,4-difluoro-2-(3,5-dicyano-phenoxy)nitrobenzene III (R2=3,5-dicyanophenyl). The ether can be convert to IV (R2=3,5-dicyanophenyl) as described below.

Provenance & Evidence