3-(Tetramethyl-1,3,2-dioxaborolan-2-yl)-5-(trifluoromethyl)pyridine → 4,6-Dimethyl-5'-trifluoromethyl-[2,3']bipyridinyl-5-carboxylic acid ethyl ester

Participants

Reaction Steps

In analogy to the procedures described for example 1, for intermediate 5B and for intermediate 1, the title compound has been prepared by the following reaction sequence: i) 6-chloro-2,4-dimethyl-nicotinic acid ethyl ester [Zhou, Y.; Bridger, G. J.; Skerlj, R. T.; Bogucki, D.; Yang, W.; Bourque, E.; Langille, J.; Li, T.-S.; Metz, M. U.S. Pat. Appl. Publ. (2005), US 2005277668 A1] was reacted with 3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-5-trifluoromethyl-pyridine (intermediate 6) to give 4,6-dimethyl-5′-trifluoromethyl-[2,3′]bipyridinyl-5-carboxylic acid ethyl ester; ii) 4,6-dimethyl-5′-trifluoromethyl-[2,3′]bipyridinyl-5-carboxylic acid ethyl ester has been saponified to give 4,6-dimethyl-5′-trifluoromethyl-[2,3′]bipyridinyl-5-carboxylic acid; iii) 4,6-dimethyl-5′-trifluoromethyl-[2,3′]bipyridinyl-5-carboxylic acid was converted into its acid chloride and reacted with 4-pyrrolidin-1-yl-piperidine to give the title compound as colorless amorphous solid. MS: 433.3 (MH+).

Provenance & Evidence