4-Bromo-2,6-dimethylbenzoic acid → Benzoic acid 1'-(4-bromo-2,6-dimethyl-benzoyl)-[1,4']bipiperidinyl-4-yl ester

Beteiligte Stoffe

Reaktionsschritte

In analogy to the procedures described for intermediates 3B, 3C, 1, 4B and for example 1, the title compound has been prepared by the following reaction sequence: i) 4-hydroxy-[1,4′]bipiperidinyl-1′-carboxylic acid tert-butyl ester [Lawrence, L.; Rigby, A.; Sanganee, H.; Springthorpe, B. PCT Int. Appl. (2001), WO 2001077101 A1] was reacted with benzoyl chloride to give 4-benzoyloxy-[1,4′]bipiperidinyl-1′-carboxylic acid tert-butyl ester; ii) 4-benzoyloxy-[1,4′]bipiperidinyl-1′-carboxylic acid tert-butyl ester was reacted with trifluoroacetic acid to give benzoic acid [1,4′]bipiperidinyl-4-yl ester; iii) 4-bromo-2,6-dimethyl-benzoic acid was converted into its acid chloride and reacted with benzoic acid [1,4′]bipiperidinyl-4-yl ester to give benzoic acid 1′-(4-bromo-2,6-dimethyl-benzoyl)-[1,4′]bipiperidinyl-4-yl ester; iv) benzoic acid 1′-(4-bromo-2,6-dimethyl-benzoyl)-[1,4′]bipiperidinyl-4-yl ester was saponified to give (4-bromo-2,6-dimethyl-phenyl)-(4-hydroxy-[1,4′]bipiperidinyl-1′-yl)-methanone; v) Suzuki reaction of (4-bromo-2,6-dimethyl-phenyl)-(4-hydroxy-[1,4′]bipiperidinyl-1′-yl)-methanone with 3-trifluoromethyl-phenyl boronic acid gave the title compound as light brown solid. MS: 461.3 (MH+).

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