Benzoyl chloride → 4-Benzoyloxy-[1,4']bipiperidinyl-1'-carboxylic acid tert-butyl ester

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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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